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Hiv is not transmitted by food or saliva, period including this claim of seeing cases of prechewed food transmitting to children. That's not true.
Even for infants
I have seen some cases where prechewed food seem to cause infection in babies
I am really worried
You can realize that is not a realistic scenario to catch hiv since many people eat other people's food but you don't read about people getting hiv in restaurants etc.
Only non sex risk is sharing hollow needles that you use to inject with and the baby was a long way from that.