Babies Actually Prefer Baby Talk
Contrary to common belief, babies are not learning to speak from baby talk, they are physically craving it. The exaggerated pitch and slower tempo of this speech style act as a sensory roadmap that helps infants map out complex language patterns.
When adults use baby talk, they naturally exaggerate vowel sounds and rhythm, which makes it much easier for a developing brain to process auditory input. Infants show a distinct preference for this style over standard adult conversation because it helps them isolate the building blocks of communication. This form of interaction is not just silly sound play but a vital biological tool. It effectively serves as a high-contrast training signal that accelerates how fast a child learns to decode the world around them.
Source: Baby talk