El embarazo semana a semana

Semana 1 La semana 1 es el periodo en el que se sientan las bases de tu embarazo, aunque todavía no sea visible. Técnicamente, en esta etapa aún no ha ocurrido la fecundación; tu cuerpo se está preparando para un posible embarazo. El revestimiento uterino se renueva, las hormonas se ajustan y comienzan los preparativos para el proceso de ovulación. Es posible que no te sientas embarazada o que no notes ningún síntoma, pero tu cuerpo se está preparando en silencio para este gran viaje.

Week 2 is biologically the week of the "Big Meeting," meaning fertilization takes place. Technically, you are still at the very beginning of your pregnancy, but the most important date of the century is about to happen inside your body.

Week 3 is one of the most mysterious, microscopic, yet vital weeks of your pregnancy journey. This week, the fertilized egg divides rapidly as it travels toward the uterus to implant itself. You may not be 100% sure you are pregnant yet, but a big settling-in plan is already in motion inside.

La semana 4 es un momento clave en el que tu viaje de embarazo se vuelve oficial. Por lo general, en esta etapa se produce el retraso del periodo y el embarazo se confirma al ver las dos líneas en la prueba. Tu bebé tiene ahora el tamaño aproximado de una semilla de amapola (1-2 mm). Este pequeño ser, que ahora se denomina embrión, se ha implantado firmemente en tu útero para continuar con su desarrollo.

Week 5 is when pregnancy starts to feel real. At this stage, your baby is about the size of a poppy seed (2 mm). It is no longer just a line on a test strip; you are in a process of change that resonates through every cell of your body. Your baby’s heart begins its first beat this week!

Week 6 is an exciting milestone in your pregnancy journey where things start feeling more real, and you may even see your baby’s heartbeat for the first time. Now about the size of a sweet pea (5-6 mm), your baby’s facial features and organs are beginning to take shape. Meanwhile, your body is going through significant hormonal changes to welcome its new guest.

Week 7 is a time when your baby’s development gains momentum and you begin to feel these physical changes more intensely. Your baby has doubled in size since last week! They are now about 10 mm long, which is roughly the size of a blueberry.

Week 8 is one of the most important milestones of your pregnancy. Your baby is technically preparing to transition from the embryo stage to the fetus stage. While your baby, now about the size of a raspberry (1.6 cm), continues to develop their heart and brain rapidly, this week may be a time when pregnancy symptoms like nausea and fatigue peak, testing your patience.

Week 9 is a major milestone in your pregnancy journey because your baby is now medically transitioning from an embryo to a fetus. While your baby’s development continues rapidly, reaching about the size of a grape (2.3 cm), you may feel pregnancy symptoms most intensely during this period as hCG hormone levels peak. Hang in there; the relief of the second trimester is just around the corner!

Week 10 is an incredible week, often considered a critical milestone in pregnancy. Your baby has reached about 30 mm in size, roughly the size of a plum. Almost all of their vital organs have finished forming, and they are now moving from the construction phase to the growth and maturation phase. For you, this is a time when clothes start feeling a bit tight and your pregnancy begins to show.

La semana 11 es una etapa de transición en la que te acercas al final del Primer Trimestre. El desarrollo de tu bebé se acelera y tú empezarás a sentirte más enérgica poco a poco. Tu bebé tiene ahora el tamaño aproximado de una lima (4-5 cm).

Week 12 is like a graduation week in your pregnancy journey. Congratulations! You have reached the end of the first trimester. This week, your baby has reached the size of a lime (5.4 cm). It is a very special period where you may feel a great sense of relief both physically and emotionally, as development now enters the maturation phase. With the end of this week, you will successfully complete your first trimester! Your baby is now fully ready and starting their growth marathon.

Week 13 opens the door to a brand new phase in your pregnancy journey. You have now officially entered the second trimester — congratulations! Your baby has reached the size of a lemon (about 7-8 cm) this week. This is a transition week where your body adapts better to pregnancy, your energy slowly begins to return, and most expectant parents start to feel more balanced. For your baby, it is now a time of rapid growth and strengthening. The vital organs are all in place; now, the details and fine-tuning begin. Movements are increasing, reflexes are developing, and that tiny body is becoming more defined every day. With week 13, pregnancy becomes more fluid; morning sickness may decrease, emotions may settle, and the enjoyable parts of this journey start to be felt more deeply. You are no longer just moving forward — you are growing.

¡Te damos la bienvenida a la semana 14! Ya te encuentras oficialmente en el segundo trimestre, conocido como la "época dorada" del embarazo. Los días agotadores, con náuseas y desafíos de los primeros tres meses han quedado atrás en su mayoría. Mientras tu bebé alcanza esta semana el tamaño aproximado de un limón (8.9 cm / 42.5 gramos), sus estructuras vitales como los músculos faciales y los riñones continúan desarrollándose. Ahora es momento de recuperar energías y disfrutar de esta importante etapa de desarrollo.

La semana 15 es el punto medio de la famosa fase de "luna de miel" del embarazo. Tu bebé ya tiene el tamaño de una manzana o naranja, es decir, mide unos 10 cm y empieza a explorar su mundo interior. En esta etapa, el desarrollo del sistema óseo del bebé se acelera y sus movimientos son más coordinados. Para ti, esta es una etapa maravillosa en la que el embarazo se vuelve físicamente más evidente, pero tu energía sigue siendo alta.

Week 16 is a major highlight of your pregnancy journey. At this stage, you may begin to feel your baby’s first movements, which are often described as light flutters or bubbles. Your baby is now the size of an avocado and is moving energetically, measuring approximately 11-12 cm in length.

¡Te damos la bienvenida a la semana 17! Tu bebé ya tiene el tamaño de una granada grande (unos 13 cm). Esta semana, el cuerpo de tu bebé comienza a acumular grasa; esto significa que se están sentando las bases de sus famosos y adorables rollitos. Para ti, es una etapa en la que el apetito aumenta y la energía está al máximo, pero los dolores de espalda empiezan a hacerse notar.

¡Te damos la bienvenida a la semana 18! Esta semana comienzas la etapa de la Ecografía Morfológica, uno de los hitos más importantes del embarazo. Tu bebé ya tiene el tamaño de una batata. Ahora puede escuchar tu voz con claridad y pasa el tiempo chupándose sus pequeños dedos en tu interior.

¡Te damos la bienvenida a la semana 19! Ya estás casi a mitad de camino. Tu bebé ya tiene el tamaño de un mango grande o un tomate (unos 15 cm). Esta semana, la piel de tu bebé comienza a cubrirse con una sustancia especial llamada vernix caseosa, que sirve para protegerla. Para ti, es una etapa en la que aumenta el apetito, pero los dolores de espalda y la acidez estomacal pueden ser un poco más notorios.

Congratulations! You have reached the halfway point of your pregnancy. Week 20 is a major milestone where your baby is now the size of a banana. You will notice their movements are evolving from tiny flutters into distinct kicks as they grow stronger. This is an important time for both celebration and monitoring your baby’s health in detail.

¡Te damos la bienvenida a la semana 21! ¡Felicidades! Ya has pasado la mitad del camino y comienzas la segunda etapa de tu embarazo. Tu bebé tiene ahora el tamaño aproximado de una zanahoria grande. Mientras su sistema digestivo sigue desarrollándose esta semana, comenzarás a sentir las pataditas de tu bebé de forma mucho más clara y rítmica.

Welcome to week 22! Your baby is now about 14-15 cm long, roughly the size of a coconut or a papaya. This week, your baby’s appearance is like a miniature version of how they will look at birth. For you, it is an interesting phase where your appetite increases, but you may also start experiencing forgetfulness and clumsiness, often called pregnancy brain.

La semana 23 es un hito fundamental en el proceso del embarazo. En la literatura médica, esta semana se considera el inicio del límite de viabilidad, momento en el que el bebé comienza a desarrollar la capacidad de adaptarse al mundo fuera del útero. Tu bebé mide ahora unos 29 cm y pesa cerca de 500 g, teniendo el tamaño de una berenjena o un mango grande.

Week 24 is a wonderful week as you approach the end of your second trimester and your baby has now reached the size of an ear of corn. This week marks a medical milestone with the start of the glucose screening test period, while your baby’s lungs speed up their development to prepare for the outside world.

La semana 25 es una etapa en la que te acercas al final del segundo trimestre, tu bebé gana peso rápidamente y ya reacciona al mundo exterior. Actualmente, el bebé mide aproximadamente 34.6 cm, pesa 660 gramos y tiene el tamaño de una coliflor. En este periodo, sus pulmones y vasos sanguíneos continúan su desarrollo para prepararse para el exterior.

Welcome to week 26! You are nearing the end of your second trimester. Your baby is now about 35 cm long. The biggest highlight in your baby's world this week is finally opening their eyes!

With week 27, you are entering the Third Trimester, the most exciting and final stretch of your pregnancy. This week is a medical and biological milestone, as your baby’s chance of survival in the outside world has now risen above 90%. Your baby is now about the size of a cauliflower or a large head of lettuce (approximately 36.6 cm / 875 grams).

La semana 28 marca el inicio oficial del tercer trimestre. En este punto, tu bebé ha alcanzado un hito crítico de viabilidad y tu cuerpo comienza a prepararse para el parto. Actualmente, tu bebé tiene aproximadamente el tamaño de una berenjena grande.

Week 29 is an exciting stage as you move deeper into the third trimester and prepare for the grand finale of your pregnancy. This week, your baby has reached the size of a butternut squash or a large cauliflower (about 38-39 cm and 1.1-1.2 kg), and you may begin to feel the physical weight more clearly. Every movement becomes more meaningful, and every preparation feels more real. For your baby, this is a week of perfecting survival skills. While their lungs gear up to breathe the air of the outside world, their brain continues to weave a complex network with billions of new neurons. They are no longer just a growing life inside you; they are a tiny individual with their own character, reacting to light, sound, and even the flavors of the food you eat. Your body, meanwhile, moves into a mode of preserving its reserves. As your blood volume approaches its peak, your heart and lungs work harder than ever. Week 29 is a time when patience, physical endurance, and the silent bond you share with your baby are felt most strongly. You have traveled most of the way; now, each passing day brings you one step closer to the miracle.

Week 30 is a time when you are approaching the final stretch of your pregnancy journey and preparations are becoming more serious. Your baby is now as heavy as a large cabbage and is about 40 cm long. This week is a stage where your baby begins to react to the outside world not just physically, but mentally as well. For you, while managing increasing back pain and sleeplessness, the countdown to the day you hold your baby is picking up speed. Every kick is now stronger, and every movement is felt more clearly.

La semana 31 marca un momento crucial del tercer trimestre, donde la cuenta regresiva se vuelve más emocionante. ¡Felicidades, ya has superado la mayor parte del trayecto! Esta fase se caracteriza por el aumento de peso tanto tuyo como de tu bebé. Tu abdomen es ahora mucho más prominente y tus movimientos pueden ser más pausados, pero tu mente está más enfocada que nunca en el encuentro con tu hijo. Para el bebé, este es un tiempo de grandes avances en su percepción del mundo. No solo está creciendo, sino que también está refinando sus cinco sentidos. Mientras las conexiones en su cerebro se desarrollan a un ritmo increíble, sus depósitos de grasa se llenan para darle esa apariencia tierna y saludable de un recién nacido. A partir de esta semana, el embarazo alcanza una intensidad física mayor. Pueden aparecer dificultades para respirar o presión en el estómago, pero cada patada enérgica es el mejor recordatorio de por qué este viaje vale la pena. Estás llegando al final y cada día te acerca más a ese milagro que pronto sostendrás en tus brazos.

La semana 32 marca la recta final del maratón del embarazo, ese periodo especial donde se mezclan la emoción y el peso físico. ¡Felicidades, ya has recorrido la mayor parte del camino! Esta semana es una etapa en la que tu cuerpo realiza preparativos importantes para el parto y tu abdomen se siente más tenso que nunca debido a la expansión del útero. Para tu bebé, este periodo es una fase de almacenamiento y maduración. Tu bebé, que ya tiene el tamaño de una calabaza (unos 42 cm), está estableciendo conexiones entre sus células cerebrales a la velocidad de la luz, mientras su sistema inmunológico crea su primera línea de defensa contra el mundo exterior gracias a ti. Con la semana 32, los preparativos dan paso a una espera impaciente; el tiempo comienza a fluir tanto muy rápido como muy lento.

Week 33 is a stage in the final stretch of your pregnancy where your baby is nearly ready for the outside world, though space inside the womb is getting quite tight. This week, your baby is about the size of a pineapple. While your body performs important rehearsals for birth, your baby’s immune system and bone structure are beginning to reach their strongest form.

As you enter week 34, you are in the final stretch of your pregnancy journey. Your baby has grown to the size of a cantaloupe and weighs approximately 2100 - 2300 grams. Reaching this week is a major medical milestone, as babies born now typically adapt well to life outside the womb with medical assistance and face minimal risks of long-term health complications.

Welcome to week 35! You are now in the final stretch of your pregnancy, with birth only a few weeks away. Your baby is approximately 46 cm long and weighs 2400 grams, which is about the size of a honeydew melon. Although your baby’s physical development is nearly complete as they prepare for the outside world, you may feel your body getting heavier during this time.

Welcome to week 36! Your pregnancy has now reached the early term stage, meaning the risk of preterm birth has passed. Your baby, now approximately the size of a head of lettuce, is busy completing final preparations for birth as your due date approaches.

¡Bienvenida a la semana 37! ¡Felicidades! Tu embarazo ahora se considera médicamente como a término temprano. Esto significa que los órganos de tu bebé ya están lo suficientemente desarrollados para sobrevivir sin ayuda en el mundo exterior y el parto podría comenzar en cualquier momento. Tu bebé mide ahora unos 48.5 cm y pesa 2.85 kg, aproximadamente el tamaño de un manojo de acelgas o un melón grande.

En la semana 38 el embarazo se considera a término y el parto puede ocurrir en cualquier momento. Tu bebé ya está listo para el mundo exterior, mide aproximadamente 50 cm, pesa 3100 gramos y tiene el tamaño de una sandía. Los cambios en tu cuerpo están totalmente enfocados en la preparación para el nacimiento.

¡Bienvenida a la semana 39! Ya estás en la gran semana final, donde el embarazo se considera oficialmente a término, las maletas esperan junto a la puerta y solo faltan unos días, o tal vez horas, para conocer a tu bebé. Tu bebé tiene ahora aproximadamente el tamaño de una sandía, pesa una media de 3300 gramos y mide 50 cm, estando completamente listo para el mundo exterior.

Week 40 is the official finish line of your pregnancy journey, and your due date has finally arrived. This week, your baby has fully completed their development and is ready to enter the outside world at any moment. For you, it is a time when excitement and anticipation reach their peak. Your baby is now about the size of a pumpkin or a large watermelon.

Week 41 is a stage in your pregnancy journey where your expected due date has passed, a phase medically known as being post-term that requires a little extra patience. Your baby is now about the size of a watermelon and, although they are fully ready for life outside the womb, they haven't quite given up their cozy home just yet.

Week 42 is the final stage of pregnancy, known as post-term or overdue. This medical milestone marks exactly two weeks past your due date, a time when clinical monitoring becomes essential. Your baby is now about the size of a large watermelon and has completed their final preparations to enter the outside world from the womb.