• The fetus is approximately nine to 10 inches long.
• Another person can detect a heartbeat by listening to the woman's abdomen.
• Brain activity shows that the fetus can respond to touch.
• The fetus responds to a light shown on the mother's abdomen by turning its head toward the light.

The length of a standard #10 envelope is 9.5 inches.

Click here for a list of clinics offering free pre-natal ultrasounds