At 10 weeks and barely the size of a kumquat, your baby is entering the fetal stage of development. His facial features are defined and his tooth buds are forming. Over the next week, his tissues and organs will rapidly grow and mature. The webbing is gone between his fingers and toes, and his nails and fingerprints are developing. Your baby can opening closes his fits and curl his toes. Thanks to his developing muscles and reflexes, he is now moving his limbs and kicking up a storm. If this is your first baby though, you likely won’t feel his flutters until 18 to 20 weeks. Through translucent skin, his vital organs are visible and functioning, including his growing brains, nervous system, intestines and liver, which is making red blood cells in place the disappearing yolk sac. The umbilical cord is working hard now, one vein delivers oxygen and nutrient rich blood to your baby. Two arteries then carry the blood away.
Around week 12 the kidneys have begun producing urine, which your baby will soon start excreting into the amniotic fluid. He will swallow the fluid and the process will begin again.
By week 14, your baby’s eyes and ears have moved into place, and he can squint, frown and grimace. You are now beginning the second trimester of pregnancy, which many women say is when they feel their best.