Literally never, can't think of one time.
I can and do recognize a good looking baby, like obviously, some babies are objectively more attractive than others — BABY SHAMING HERE — but still no cute.
What's cute about babies? Is it a 100% hormonal response?
For what it's worth I'm still considering having a kid because kids seem fun and insane. But babies? Just a stage of not cuteness I'd have to pass through.