Question

How is the sex of a new-born determined in humans?

Answer 1

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this can be determined by checking the chromosomes in new born child.
if the sex of child is XX then she is a girl.
if the sex of child is XY then he is. a boy

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Answer 2

Answer:

when the baby is conceived , a chromosome from the sperm cell, either X or Y , fuses with the X chromosomes in the egg cell , determining whether the baby will be female [XX] or male  [ XY] . A foetus doesn't develop its external sexual organs until the second month of pregnancy - seven weeks after conception.