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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!
Even though your little one isn't saying many words, he is babbling a lot and attempting to imitate the sounds heard from others around her. Parents should be hearing vowel and consonant babbling by 8 or 9 months, and it continues as baby starts to form words around 12 months, Dr. Briggs says.