I remember reading about this in older bodybuilding books, and it looks like it’s still a circulating urban legend. Yet I’ve never seen or even heard about it mentioned when talking to other lifters in real life.
Baby food is expensive and not very tasty, unless you’re stealing it from the single mom you’re living with I don’t see why it would ever be an option? Seems like a joke that got out of hand to the point where people believe it’s actually real, like this clown:

Wes, hazbin, et al: ever eaten baby food or known anyone that did?? Or is this just an urban legend