Early Developments at 5 Weeks Pregnant

Reviewed by Terri Forehand RN
Terri Forehand RN Terri Forehand RN

Terri is a critical care nurse with over 35 years of experience. She is also a freelance writer and author.

5-weeks-pregnant woman napping

You're five weeks pregnant, and it has now been three weeks since your baby was conceived. Once you enter into fifth week of your pregnancy, you will have missed your period. Things are far enough along now that you can trust the results you receive on your home pregnancy test. Your body is changing rapidly, and you may be starting to notice a few early pregnancy symptoms.

Your Baby's Development

During week five of your pregnancy, your baby is further maturing. The chronic villa, meaning the cells along the wall of the uterus that form the placenta, will fully develop. A yolk sac will have developed around the embryo, and it will help feed the baby for the next few weeks as the placenta is developing.

According to the National Institute of Health, the baby's brain, spinal column, gastrointestinal tract, and heart are beginning to develop this week. The embryo is about the size of a sesame seed now and consists of three layers:

  • The inner layer, or endoderm, will develop into the baby's lungs, liver, and digestive system.
  • The middle layer, or mesoderm, will become the baby's bones, kidneys, sex organs, and heart.
  • The outer layer, or ectoderm, will become the baby's skin, hair, eyes, and nervous system.
embryo at 5 weeks pregnant
Download this pregnancy calendar

If you need help downloading the pregnancy calendar, check out these helpful tips.

Looking Forward

This is an exciting time in your life and the changes, both in your baby and your body, will occur rapidly over the next few weeks. Relax and remember to embrace the uncertainty.

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Early Developments at 5 Weeks Pregnant