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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!
Between about 29 weeks and 33 weeks your baby starts to make out high-pitched sounds too, such as a child's cry or a car alarm. You may be able to tell if your baby can hear sounds outside your womb (uterus) by playing music, and reading or talking to him. If he can hear what's going on, he may respond by moving around more. Studies of newborn behaviour show that babies get used to the music and voices they've heard in the womb.