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A: Your baby's ears begin to grow when you're about eight weeks pregnant and are completely formed by about 24 weeks. But your baby can start hearing her first sounds -- like your heartbeat or blood whooshing through the umbilical cord -- around 18 weeks, when the bones of the inner ear and the nerve endings from the brain are developed enough. She may even be startled by loud noises!
At about 4 months, babies start to look for the source of a sound, and by 6 months they try to imitate sounds. By 8 months, they babble and respond to changes in tone of voice. By your baby's first birthday, she'll probably say single words like ma-ma and da-da and respond to her own name.