At 18 weeks, baby will be able to begin hearing sounds within your own body, like your heartbeat, digestion and blood flow. These noises are just the beginning though! Baby will be able to hear noises coming from outside the womb closer to 27 weeks, at which point their hearing abilities will only keep getting better. By the time baby is full-term, their hearing will be as good as an adult’s, and they’ll become familiar with the sound of your voice, any music you regularly play and any other sounds that recur during your daily activities.