![]() ![]() ![]() Week 20 - Your baby is approximately 10 inches long and weighs 12 ounces.Your baby's circulatory system is fully functional, as the umbilical cord thickens to carry liters of blood and nourishment daily from you to the baby. Newborns arrive coated in vernix, which is cleaned off immediately after delivery. Week 19 - Your baby begins secreting vernix, the waxy coating that protects the skin from the amniotic fluid and cushions it against scratches from its own toes and fingers as it kicks and rolls.Your baby's skin is loose and wrinkled, without yet a layer of fat underneath. Week 18 - Your baby's heart pumps 144 liters of blood a day, creating enough percussion to be heard faintly through a stethoscope.Now you can feel the baby's kicks and rolls. Your baby's bones are hard and the joints flexible. Week 17 - By the middle of the second trimester, your baby is about eight inches long and weighs half a pound. ![]() Even identical twins have different patterns. The fingertips already have ridged patterns unique to each baby. Brain development continues years after birth. Week 16 - In the second trimester, your baby's fetal brain develops folds on its surface, signaling the advancement of its many regions, especially in the forebrain that controls the intellect, motor control and memory.The curled fetus now begins to straighten out, as the back grows stronger and the head becomes proportionally smaller than the rapidly lengthening body. Week 15 - This month your baby will double in length to six inches in a sitting position and quadruple its weight from 1-4 oz.Now your baby can move around in her amniotic bath, although you cannot yet feel these movements. The neck is straighter and strong, and the head is able to turn. Week 14 - Your baby's eyes have moved forward and ears have moved upward on the head.Your baby can suck her thumb, strengthening and filling out the cheek and jaw muscles. Because your baby will use his hands before he walks on his feet, hands develop earlier in utero than feet do. Fetal development parallels the developmental stages of infancy. The feet, with separated toes and developed heels, are also nearly formed. Week 13 - Your baby's hands have 27 bones connected by ligaments, which are structurally complete.Your baby will also begin reacting to sound. Hair starts to grown on the head and downy hair, called lanugo starts to cover the baby's body. You may feel the baby moving and be able to tell when they're sleeping or moving. During your second trimester, baby's toenails, eyebrows and hair are starting to grow and teeth are forming under the gums. ![]()
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