When can babies hear sounds

Patient's question:

No

Doctor's answer:

When the baby is born, the middle ear has no air, and their hearing is poor. By 3-7 days, their hearing has improved significantly. By 3-4 months, they can turn their head toward the sound source. They smile when they hear pleasant sounds. By 7-9 months, they can determine the sound source and distinguish the meaning of language. By 13-16 months, they can locate sound sources at different heights and understand their own name being called.