The baby now measures about 4.3 to 4.6 inches and weighs about 3.5 ounces. You should be able to feel the top of your uterus about 3 inches below your belly button. The baby’s eyes can blink and the heart and blood vessels are fully formed. The baby’s fingers and toes have fingerprints. Swipe to advance 7/13 Development at 20 Weeks
At 8 weeks during the first trimester, a baby has the following features: Organs and body structures are beginning to take form. The heart beats in a customary rhythm. The limbs are growing longer and the fingers and toes are starting to form. The sex organs are beginning to form.
Pregnancy and Fetal Development. Picture of First Trimester (4 Weeks) First Trimester: The Baby at 4 Weeks. Your baby’s brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear.