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Baby Development By Trimester

Baby Development By Trimester

When can a baby hear sound from outside the womb?

Some studies have suggested that babies begin hearing at 20 weeks of pregnancy, and that they are able to distinguish their mother's voice, says Dr. Doubilet.

"What we know with certainty, based on direct ultrasound visualization, is that the baby responds to loud noises or buzzing sounds in the third trimester. When we do an ultrasound while placing a small buzzer on the mother's abdomen, we can watch the baby make a sudden movement of his/her arms and legs in response to the buzzes. This startle reaction is a reassuring sign of good health."