The thing is that the baby creatures of some mobs (I only saw Zombie and Polar Bear) are bugged in the sense that their model is destroyed or is not to scale. The baby zombie when it attacks you its arms come out of the body; the baby polar bears have a separate body, here is a picture.
Sorry if this information isn't very good and you don't undestand but i do the best.
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We're tracking this issue in MC-275221 and MC-275361, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-275361 and MC-275221.