Your developing baby – week 6

by Kaiser Permanente |
Fetus at week 6, illustration

By the time you're 6 weeks pregnant, your baby is about the size of a lentil. Your baby's:

  • Lungs are beginning to form
  • Brain and nervous system are quickly developing
  • Arm and leg buds have lengthened, with feet and hands starting to appear
  • Fingers and toes are starting to develop
  • Head is developing a small sac on each side where the eyes will form

The inner ears, digestive system, and respiratory system are also starting to develop.

This article has been created by a national group of Kaiser Permanente ob-gyns, certified nurse-midwives, pediatricians, lactation consultants and other specialists who came together to provide you with the best pregnancy, birth, postpartum, and newborn information.

Some of the content is used and adapted with permission of The Permanente Medical Group.