From: Piotr Gasiorowski
>> [PG] I don't know of any such. But the existence of something likeSorry, I didn't express myself clearly. In the case of 'father', I
>> *mama, *mamma, *ama or *amma for 'mom' is almost guaranteed by the
>> general tendencies of baby-talk (not to mention the existence of
>> such items in historically known IE languages). For 'dad' we find
>> words of the same structure but with *t or *p instead of *m.
> I cannot acknowledge any such guarantee. A quick look at the language
> outside of IE around the world will assure even the most casual
> student that every imaginable consonant has been pressed into service
> somewhere to express the idea of 'mother' and 'father'.