How Baby Develop In Womb Week By Week

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Pregnancy is a beautiful journey filled with excitement and anticipation as you wait for your little one to arrive. However, it is also a time of many questions and concerns about how your baby is growing and developing inside your womb. That’s why we’ve put together a week-by-week guide to help you understand how your baby is developing in the womb.

Week 1-4: Conception to Embryo

The first four weeks of pregnancy are crucial as this is when conception occurs, and the fertilized egg implants itself in the womb. At this stage, your baby is called an embryo, and it is about the size of a poppy seed. The embryo will start to develop its major organs and systems such as the heart, brain, and nervous system.

Week 5-8: Fetal Period Begins

During this period, your baby is now called a fetus and is about the size of a grape. The fingers and toes start to form, and the little one now has a face with eyes, ears, and a nose. The heart is now fully formed, and by the end of this period, it will start to pump blood.

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Week 9-12: Rapid Growth and Movement

This is the period when your baby starts to grow rapidly, and its movements become more frequent. The fingers and toes are now separated, and the little one can make a fist. The major organs and systems are now fully formed, and the baby’s sex can be determined.

Week 13-16: Developing Senses

During this period, your baby’s senses start to develop. The little one can now hear your voice, and you may notice it moving in response to loud noises. The eyes start to move, and the baby can now see light. The skin is now becoming more opaque, and you may be able to see veins through it.

Week 17-20: Quickening and Hair Growth

This period is when you will start to feel your baby’s movements, a process called quickening. The little one is now covered in fine hair called lanugo, and its eyebrows and eyelashes are starting to grow. The baby is now swallowing amniotic fluid, which helps to develop its digestive system.

Week 21-24: Developing Lungs and Brain

During this period, your baby’s lungs are starting to develop, and it can now breathe in amniotic fluid. The brain is also developing rapidly, and the baby’s senses are becoming more refined. The little one is now covered in vernix, a waxy substance that protects its skin.

Week 25-28: Eyes Open and Fat Deposits

This period is when your baby’s eyes start to open, and it can now see light and dark. The little one is now covered in more fat deposits, which help to regulate its body temperature. The lungs are now fully formed, and the baby can now breathe air.

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Week 29-32: Final Growth Spurt

During this period, your baby is in its final growth spurt and is rapidly putting on weight. The little one’s bones are now fully developed, and its skin is becoming smoother. The baby is now practicing breathing, and you may notice its hiccups.

Week 33-36: Preparing for Birth

During this period, your baby is preparing for birth by moving into the head-down position. The little one’s immune system is now becoming more robust, and it is developing a layer of fat to help regulate its body temperature. The baby’s movements may start to slow down as it runs out of room in the womb.

Week 37-40: Full Term

During this period, your baby is considered full-term, and it can arrive any day now. The little one is now fully developed, and its lungs are now ready to breathe air. The baby’s head is now engaged in the pelvis, and you may start to experience Braxton Hicks contractions.


The journey of pregnancy is an incredible one, and watching your baby grow and develop in the womb is truly magical. By understanding how your baby develops week by week, you can have a better understanding of what is happening inside your body and what to expect as your due date approaches. Remember to take care of yourself, eat well, and get plenty of rest, and your little one will be here before you know it.

Frequently Asked Questions

Q: What can I do to help my baby develop in the womb?

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A: Eating a healthy diet, staying active, and getting plenty of rest can all help to promote your baby’s healthy development in the womb.

Q: Can stress affect my baby’s development in the womb?

A: Yes, prolonged and severe stress can affect your baby’s development in the womb. It’s important to find ways to manage your stress and seek help if needed.

Q: How often should I see my doctor during pregnancy?

A: It is recommended to see your doctor at least once a month during the first and second trimesters, and then more frequently as your due date approaches.

Q: Can I still exercise during pregnancy?

A: Yes, exercise is generally safe during pregnancy and can help to promote a healthy pregnancy and delivery. However, it’s important to talk to your doctor before starting any new exercise routine.

Q: When should I start preparing for my baby’s arrival?

A: It’s never too early to start preparing for your baby’s arrival. From setting up a nursery to buying the necessary baby gear, it’s always better to be prepared ahead of time.

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By administrator

I am a child development specialist with a strong passion for helping parents navigate the exciting and sometimes challenging journey of raising a child. Through my website, I aim to provide parents with practical advice and reliable information on topics such as infant sleep, feeding, cognitive and physical development, and much more. As a mother of two young children myself, I understand the joys and struggles of parenting and am committed to supporting other parents on their journey.

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