Baby zombies have the regular zombies sound where the intended sound is supposed to be a higher pitch of the sound. This allowed people to be aware that a baby zombie is near them in PC as they are much more dangerous as regular zombies.
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This is due to difficulties in updating sounds on certain devices, and will most likely be fixed in a later release. Please direct all comments on this issue (baby animals utilizing the adult audio) to MCPE-4202 for the time being. 🙂
thats because the android version of the game still uses an old sound engine