At auto end de the seconde trimester, your baby measures about 25 cm and weighs approximately 1 kg. Here are the main stages de development.

Vous lisez ce: Bébé 3 kg à 8 mois de grossesse

Your baby’s growth speeds up during the second trimester. Tu can feel their movements much more acutely. Their senses space beginning à develop. Your belly is likewise growing. De the end de the seconde trimester, your baby will measure about 25 cm from crown to rump et weigh about 1 kg. Below are the henchmen stages de development, week by week.

To learn an ext about auto earlier and later stages, review our reality sheets on fetal advance during thé first and third trimesters.

This truth sheet focuses nous the baby’s development. To learn much more about comment mothers suffer the lundi trimester, elle can read our reality sheet entitled lundi trimester: physics changes and common discomforts.

Length ns pregnancy and due dateSince that difficult à determine the précis day du conception, health specialists calculate the duration du pregnancy in weeks of amenorrhea, or weeks there is no menstruation. Your due cétait une date is therefore counted native the sapin day de your critical period. Consequently, 14 days are included to thé length du your pregnancy. According to this method, tu aren’t in reality pregnant in the first 2 weeks et conception wake up in thé third week du pregnancy.

Week 15: baby is beginning to move

Your baby begins a period du accelerated expansion 13 weeks after conception. Lock measure around 9.5 cm from couronner to rump and weigh around 80 g.
Each organ deserve to start fulfilling that is role. Your little one’s legs space starting à be plus long than their arms.

Their network of du sang vessels is becoming an ext complex. To soutien their small, emerging body, your heart atelier steadily, pumping around 24 L of blood per day. Their heart price is between 140 et 150 beats per minute.

Your bébé is increasingly téléphone mobile, téléphone portable in auto womb. à la example, they can now turn their head, which measures about 3.5 cm. Since they still have a de nombreux of room in auto uterus, and their motions are quite subtle, it’s ordinaire that tu can’t feel them yet. Nothing worry, those kicks et punches room coming!

Your baby’s taste buds are now functional, i m sorry means elle can present them à your favourite foods. Flavours in her diet are passed nous to them through your amniotic fluid.

Week 16: bébé is stronger and more agile

Your baby is stronger et their kicks are much more pronounced.

Their movements are also meilleur coordinated. When they touch auto umbilical cord, their first reaction is à move away. Cible soon they’ll grip, pull, et push thé cord ont if it’s a toy. Their précis hands will become an ext agile.

Under her baby’s eyelids, your eyes are beginning à move. Due to the fact that your bébé is drinking a de nombreux of amniotic fluid (400 ml effronté day), lock often get the hiccups. This is perfect normal. In addition, your digestive système is starting venir produce a blackish question called meconium, which accumulation in your intestines.

At auto end de this week, your baby will measure around 11.5 cm from couronner to rump et weigh about 110 g.

Week 17: baby is growing hair

Inside her baby’s body, fat is beginning à form. This is really important. The fat (known oui brown fat) will help your bébé stay warm after birth, since newborns nothing yet have the reflex to shiver. This make reservation will likewise give them energy in their first moments de life. Your bébé is starting to develop antibodies.

By week 17, toutes les personnes their organs et systems oui formed. However, numerous stages du development are toujours to come. Their skeleton is calmer growing. Parce que le now, it’s largely soft cartilage. Your bébé measures around 13 cm from couronner to rump and weighs about 150 g.

Fine downy hair is progressively appearing.

Week 18: Is bébé a jeune or a girl?

At this stage, her baby’s proportion de change: your head is currently smaller than the rest de their body.

Blood circulation reaches their extremities, which way they’re moving a beaucoup more! In thé uterus, they’re turning over, wiggling their arms et legs, and touching their toes and face. You may feel an extremely light movements, i beg your pardon feel prefer flutters or small waves.

Additionally, a fatty protective class (myelin) currently coats your nerve fibres, prefer a plastic sheath around année electrical wire. Myelin is je vous demande pardon conducts nerve impulses, or informations exchanged in between your baby’s quartier général nervous system (brain and spinal cord) et peripheral nervous system.

Soon, their centre nervous system cells—namely, their brain cells—will be enveloped in myelin. Once that happens, connections can be made and neural networks deserve to be consolidated.

Your baby’s retinas space sensitive venir light. If a solid light is projected onto her belly, they’ll turn away and cover their eyes.

An ultrasound is performed at 18–20 weeks. The henn purpose of this test is venir ensure that your baby’s offal are arising properly (e.g., heart, kidneys, quartier général nervous system). Thé sex can also be identified. If you’re having a boy, his penis is now visible. Si you’re having a girl, her vulva et uterus space visible.

By auto end de week 18 (or week 16 because conception), your baby measures about 14 cm from couronner to rump and weighs approximately 200 g.

Week 19: baby is developing toutes les personnes five senses

This week, your bébé is going through année important change: auto areas ns their mind dedicated to the five senses room forming. That method they’re starting à process sensory information. A whole nouveau world is opened up venir them!

Neuron fabrication is slowing. Soon, neural relations will be created and consolidated. This is how learning begins.

This week, their skin is arising a white, waxy coating known as the vernix caseosa. Cette serves à protect her baby’s fragile skin native friction and irritation.

They’re growing steadily cible they still oui enough pièce in the uterus to move their arms et legs. Lock measure roughly 15 cm from couronner to rump and weigh around 260 g.

Week 20: Baby’s movements are much more noticeable

In thé womb, your bébé is learning à move their corps humain parts. Your muscles room bigger et stronger, et their movements are more vigorous. At this stage, many moms start venir feel their baby. Between active periods, your bébé is resting 18–20 hours a day.

Their skin, i beg your pardon is encore rather transparent, is beginning to thicken. The first folds de their cerebral cortex are developing.

By the end de week 20 (or week 18 after conception), your baby measures about 16 cm from crown to rump and weighs around 320 g.

Week 21: bébé is playing through their hands et feet

Your baby’s body is totally formed. De now, castle measure about 18 cm from crown to rump and weigh roughly 390 g. Throughout the next month, they’ll be getting a de nombreux of weight.

They’re becoming more and more familiar with touch. They phat catch through their feet et sometimes suck your thumb. They additionally like playing with auto umbilical cord.

Their lungs room continuing à mature. Your baby is learning to expand your chest muscles, which will aid them breath after birth.

Their eyeballs are formed but they don’t have colour (pigment) in their irises. Your lips are ending up being fuller and they have more hair.

Week 22: baby can taste sugar

Your bébé already likes thé taste de sugar! thé sweeter thé amniotic fluid, auto more lock drink. Cible thanks to their pancreas, i beg your pardon is now secreting insulin, their blood sugar level is controlled.

As your bébé grows, their fat reserves remain limited. Your skin is encore wrinkled but will stretch ont they gain weight.

During this second half of pregnancy, her baby’s brain is occurring at high speed. In their gums, two sets du teeth are forming: bébé teeth and, right behind them, fixation adult teeth. The bébé teeth will certainly be ready to come the end in thé months adhering to birth.

At this stage, your baby measures around 19 cm from crown to rump and weighs roughly 460 g.

Week 23: bébé is opened their eyes

Your baby’s corps humain is currently covered in vernix caseosa. This white, waxy coating is very important, oui the amniotic liquid has année increasingly high concentration du urine. Ont you technique your en raison de date, this protective class will gradually fade. The thin coating that continues to be will facilitate delivery.

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By the beginning ns your 6th month, your baby’s muscle development is in complete swing. You may notice that they’re particularly positif at avec certitude times. This is a authorize that they’re act well! Try venir keep track ns their movements.

Your bébé is likewise starting à open their eyes! your eyelids space coming individuel gradually. Within a few weeks, they’ll be looking around. They’re coming to be aware of light and darkness.

If you’re having a boy, his testes are gradually descending from his belly à his a venir scrotum. If you’re having actually a girl, elle reproductive système is fully formed. Sa ovaries include tous the eggs elle will ever have.

Your baby now measures approximately 20 cm from crown to rump et weighs around 540 g.

Week 24: bébé is cultivation real hair

Your baby’s immune system is developing white blood cells, which will allow their corps humain to fight éteindre disease et infection.

Their skin is thickening et has a irradiate pigment, cible is encore quite transparent. Their blood vessels (capillaries) are clearly visible.

Real hair has actually started to replace your baby’s maigrir downy hair. Their fingernails are much more distinct.

During this period, weight avoir is an extremely important. Your bébé now weighs over 630 g et measure about 21 cm from couronner to rump. They’re taking up much more space in the uterus.

If castle were bondir today, 22 weeks after conception, your baby could survive cible would require highly committed care. At this stage, they would be very premature, oui their respiratory et digestive systems space not fully developed.

Week 25: bébé knows she there!

Your bébé is beginning venir recognize bien sur elements jaune situations: your voice and the voices du other family members, daylight, avec certitude activities, the silence of the night, et more. They’ll sometimes jolt inside her belly if they’re surprised, et may respond to belly touches. In short, castle aware du your presence.

They additionally react to the sounds your corps humain makes. They have the right to hear her heartbeat, the aéronautiques entering your lungs, and the gurgle of your cradle system. Tous of these sounds patience them and lull them to sleep. It’s no surprise that, as soon as moms host their baby after delivery, they conveniently calm down. They’re reassured by toutes les personnes the acquainted sounds castle heard while in auto womb.

By now, amie can feel her baby’s movements. When they’re awake, they’re quite active. They may move 20–60 times every fifty percent hour.

Their bronchial tubes space almost fully formed, cible their lungs haven’t reached maturity.

Their eyes gradually take on pigmentation, although this color will change after birth. The ivory that protects auto enamel du their bébé teeth begins à form.

Depending conditions météorologiques your baby’s position, a person could hear your heartbeat par pressing their ear versus your belly. Your little one measures around 22.5 cm from couronner to rump and weighs roughly 720 g.

Week 26: Baby’s visage features are coming to be clearer

This week, her baby’s lungs space developing. This is a particularly considérable stage pour premature babies. The lungs room beginning venir secrete a question that will allow them venir expand more easily. This question also protects them from infection, enhancing your baby’s chance of survive outside thé womb.

Their facial features are taking shape: their eyelashes space formed, their sleep is plainly defined, your hairline is periodically visible, and their neck is an ext pronounced. From now until birth, your baby’s visage won’t change very much! They’re opening their eyes more frequently.

Their nerves are almost completely developed, and their brain now has an ext convolutions (folds in the cerebral cortex). This convolutions are additionally deeper. Synapse development will accelerate till week 32. Synapse are relationships between mind cells the allow the exchange of information. Of all your baby’s systems, thé nervous system develops slowest. Cette will continue to mature until thé end ns pregnancy.

Since thé beginning du the seconde trimester, your bébé has doubled in size. Castle measure about 23 cm from couronner to rump. They’re likewise a lot heavier, weighing approximately 820 g. They’re a third of the load they’ll it is in at birth. Already, your bébé has less room to move in utero.

Week 27: baby might be dreaming!

This week, your baby has acquired année essential reflex the will assist them communicate their needs oz they’re born: crying. Your survival depends on it!

Their circadian rate is more regular, but that doesn’t mean that it’s perfectly aligned with yours. Are they dreaming? Some spécialiser say that at this stage of development, babies are already having dreams. Fast, low-amplitude brain waves—meaning beta jaune REM waves—have to be detected. This are associated with REM sleep, when elle usually dream.

Your baby’s au sens propre hands are active. Lock working nous their dexterity! Occasionally, lock suck your thumb. Cette calms them down et allows them venir strengthen your jaw and cheek muscles.

Blood vessels now supply your lungs, which are not however mature. Your bones are likewise stronger. If they were born this week, your bébé would toujours need extensive medical care venir ensure their survival. They would certainly be very premature.

They measure about 24 cm from crown to rump et weigh roughly 920 g.

Week 28: baby is coming to be curious

Your baby is round off out and looking very cute! their skin is smoother and slightly redder tandis que to numerous small blood vessels. They’ve accumulated a great layer de fat under their skin. This week, it accounts pour approximately 3% de their total corps weight.

Gradually, thé placenta is becoming less important oui a source du nutrients. In utero, the level du amniotic fluid is decreasing. Your baby is taking up much an ext space. Their swallowing et sucking reflexes are additionally improving.

They’re curious: once they feeling light jaune hear a sound, they turn their head in that direction.

Their liver et spleen space working hard to produce a gros quantity of blood cells.

Your bébé is continuing to gain weight. Castle measure about 25 cm from couronner to rump and weigh virtually 1 kg.



Scientific review: Dr. Françoise Rypens, radiologist, CHU Sainte-Justine, and Dr. Chantal Lapierre, head of medical imagery, CHU Sainte-JustineResearch and copywriting:The Naître et cultivé teamUpdated: April 2021

Photo: 123rf/denisnata



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Campbell, Stuart. Watch me Grow: A Unique, 3-Dimensional Week-by-Week look at your Baby’s Behaviour and Development in thé Womb. St. Martin’s Press, 2004.Fortier, Marie. Mes cours prénataux : tout pour la grossesse, l’accouchement et ns retour parce que le maison. Esquive Éditions Caractère, Montreal, 2014, 304 pp.Ladewig, Patricia, et al. Maternal & child Nursing Care. 3rd ed., top Saddle River, Prentice Hall, 2011, 2,016 pp.Larousse. Vous rang votre grossesse. Éditions Larousse, France, 2002.



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