Can you believe your baby has doubled in size since last week? By week seven, your little one measures approximately one-third of an inch long! Also during week seven, your baby's arms and legs are developing, and teeny, tiny hands and feet are beginning to appear. They also have an appendix, intestines, a pancreas, and a liver. Both hemispheres of your baby's brain are growing. Nasal pits are forming. Overall, it's a big week for growth!