The generally high-pitched tone of voice that people often use to speak to infants, babies, toddlers, and even to some small pets is technically called:

Name: The generally high-pitched tone of voice that people often use to speak to infants, babies, toddlers, and even to some small pets is technically called:
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Child-directed speech, also known as "parentese," is the technical term for the high-pitched, exaggerated tone often used when speaking to infants and young children.

The Generally High-Pitched Tone of Voice That People Often Use