When I feed baby cows I don't loose any wheat.
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Dude, in the new version they grow faster if you feed them. And it did the baby cow grew in seconds, there were green particles that indicated this works. However I didn't lose any wheat.

Duplicate of MC-44610 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
Oh, well in that case, it is a bug. Sorry for the inconvenience!
It is because baby cows can't be fed, nor bred.