In humans the answer is absolutely not, although some weird things can happen like conjoined twins, or one twin dying early on and the other growing and absorbing it, however eating does not happen. Food for babies in the womb is supplied directly from the mother to the child via the umbilical cord, therefore the fetus has no requirement to eat as you and I do.
Interesting fact some species of shark do indeed have young that eat their smaller, weaker siblings while still in the womb. Cool, huh?
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