The fetus is covered with a layer of thick, downy hair called lanugo. The heartbeat can be heard clearly. First kicks may be felt. Fetus is 8-10 inches long , weights about a pound. Eyebrows and eyelids are visible.
Lungs fill with amniotic fluid and fetus begins breathing motions.
Fetus can hear mothers talking or sining. Fingernails and toenails appear. Fetus is adding half a pound per week, fat layers are building up. Weight 4-6 pounds. The greatest risk period for fetal damage due to exposure to alcohol, cigarette smoke, drugs, etc.