Why are people weird around babies?

I mean, I love my kid, but why do people have such an explosion of emotion when they look at a baby that is not theirs? As if it was something they desire so deeply that they can barely contain themselves? And why do they must express this emotion using words like "I wanna bite it", "I can't handle the baby smell!", "I just wanna eat it!", or "Yummy!" like they're the Cookie Monster and my kid is a cookie? Every time someone says those things -- usually women -- I imagine a man saying the same things, and it grosses me out. Why is it okay for women to say those things when a man cannot?

I genuinely feel nothing for babies that are not my own, so it is hard for me to understand.

Mods: please don't move this to ~life. This is meant as a causal conversation and should remain in ~talk. Thanks.