People speak to babies in a high-pitched, singsong fashion with slow, exaggerated syllables

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Speaking to babies in a high-pitched, singsong fashion with slow, exaggerated syllables is done to convey emotional tone and reward. This is known as infant-directed speech or motherese. It is not unique to North America, and in fact, it is found in many cultures around the world. There is also no evidence that this style of speech delays a baby's speech development. However, it may help them distinguish phonemes, as the exaggerated intonation and slower pace make individual word sounds more distinct.

People Speak to Babies in a High-Pitched, Singsong Fashion with Slow