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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!
Some research shows that babies as young as 4-and-a-half months can learn to distinguish the sound patterns of their own name from those of similar-sounding names. Hereâs a general timeline for when babies say their first word, when babies start talking in full sentences and when babies talk clearly: By 6 monthsâ¦ Most babies are babbling regularly by 6 months, making short strings of consonant-vowel sounds such as ba-ba, ma-ma and da-da.