Your baby can start to hear sounds and music in the womb around the second trimester of pregnancy. Specifically:

• At about 18 weeks, the baby's ears begin sending signals to the brain, and they start to hear sound, though muffled and muted.
• By 23 to 24 weeks, babies can hear muffled sounds of their mother's voice and noises from outside.
• From about 25 to 26 weeks, babies respond to voices and sounds, including music.
• By the last trimester (around 30 to 33 weeks and beyond), the baby's hearing is more developed, and they can recognize and respond to music and familiar voices.
• Studies show that babies not only hear but can recognize melodies they heard repeatedly in the womb after birth.

So, your baby can hear music in a muffled form from about 18 weeks, with responsiveness increasing significantly from 23 to 26 weeks onward, and more clear recognition happening in the third trimester.