fetal-development during pregnancy

When Can Your Baby Hear You in the Womb?

A fetus begins responding to sound around 19 to 24 weeks, first at lower frequencies, and auditory responses become broader.

When does baby's heartbeat show up on ultrasound?

Embryonic cardiac activity is often visible on transvaginal ultrasound around 6 to 7 weeks of gestational age, while exact timing varies with dating.