Really? I think this is the first time someone showed the effects of soda orange juice like fanta on the yu's, the closest thing we got was cola and that was if it was shaked a lot or mixed with mentos.
Of course I could be wrong and had missed a previous case of yu's drinking soda orange juice.
Maybe it's just too strong for the baby (or just a story specific exception). I usually stirred and shake soda bottle to release most of the gas before drinking. The popping bubbles kind of prickle on the mucous membrane in mouth and throat for peoples who's not tolerant enough.