The baby is now around 11 inches long and weighs just over a pound – however from now on he starts gaining weight.
His skin sags a bit since it grows a lot faster than fat — but soon the fat deposits fill things out. Your baby’s organs/bones are visible through his skin and he’ll become less transparent in future weeks as the fat deposits. At his point, you Can Hear Baby’s Heartbeat through a Stethoscope. Your baby’s moves more frequently; especially moving the muscles in the fingers, toes, arms, feet and his legs. As a result, you may feel more forceful movements.
His hearing is fairly well developed and he can now make out a distorted version of your voice, and hear your heart-beat. His lungs are developing to prepare for breathing. The lungs begin to produce a substance that lines the air sacs called surfactant. This surfactant allows air sacs to inflate easily. It also keeps them from collapsing and sticking together when they deflate. Moreover, the blood vessels in your baby’s lungs are growing and developing in preparation for breathing.