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. There are currently more than 20 STDs identified, with millions of people being infected every year.