You can refer to a baby as it when the discussion is about babies in general: What does a baby do when it is hungry? I would not recommend using it to refer to a specific baby, particularly in the presence of the baby's parents.
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Anonymoushi everybodyWe can use 'it' for a baby if we do not know whether the baby is male or female.
why do we use "it" for baby?
please help
thanx