Heartbeat can be detected electronically. 12th week - Vocal cords are complete and my cry silently. Brain is fully formed. Can feel pain. Digests food and excretes.
Tests can determine gender.
14th week - Opens mouth and swallows regularly. 15th week - Lower limbs are well developed and toenails start to form. 16th week - All 20 teeth buds are in place. Mother feels movement. Reacts to outside noise and vibrations.