baby talk
US /ˈbeɪ.bi ˌtɔːk/
UK /ˈbeɪ.bi ˌtɔːk/
1.
a simplified type of speech used by adults when talking to young children, or by young children learning to speak
:
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She used baby talk when speaking to her newborn niece.
•
The toddler's baby talk was adorable.