This week, the baby weighs almost 2 pounds (like a head of cauliflower) and is about 14 1/2 inches long with its legs extended.
It's sleeping and waking at regular intervals, opening and closing its eyes, and perhaps even sucking its fingers. With more brain tissue developing, your baby's brain is very active. While the lungs are still immature, they would be capable of functioning — with a lot of medical help — if the baby was born now. Chalk up any tiny rhythmic movements you may be feeling to a case of baby hiccups, which may be common from now on. Each episode usually lasts only a few moments, and they don't bother the baby, so just relax and enjoy the tickle.