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.