3d rendered medically accurate illustration of a fetus in week 37

The baby weighs around 3 kg by now and his length might increase by half an inch (19.5 inches) from head to toe. The space is your womb is at a premium for your baby, and he will position his body in the classic fetal pose. A baby’s gender seems to play some role in determining size at birth. Boys weigh slightly more than girls at a similar length of gestation.

Most of the coating of lanugo is shed and the vernix the coating that protects his developing skin – starts to disappear (though some may remain at birth). The baby swallows both, and they will stay in her bowels until birth. This mixture, called meconium, will become his first bowel movement.

The baby’s head is now cradled in your pelvic cavity and protected by your pelvic bones. This position clears space for his growing legs and buttocks. Most babies now have a full head of hair around one inch long. Your baby is simulating breathing (inhaling and exhaling amniotic fluid). He is sucking his thumb, blinking and moving from side to side.