I forgot to mention a small detail: the *bʰāt- root for “boy” seems to be an old reconstruction. Usually Proto-Indo-European roots have three consonants, and even short *a is surprisingly rare - and it’s mostly from borrowings, like the Semiticism *táwros. There’s a Proto-Slavic root that might be related, too.
Another possibility is baby talk, given the original meaning associated with “father”. That would explain the weird vowel and structure.
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