Gassy baby? Legs up to help conception?

I see a lot of pics being posted of newborns smiling. I heard that those are reflex smiles from gas lol.

The pics are super cute don't get me wrong, but all I can think is awe how cute what a gassy baby! I read that their real smiles don't start until 6-12 weeks.

Also I read that putting your legs up after sex does absolutely nothing to increase chances of conception. So when I see pics of girls with their legs in the air after sex,, yeah it's funny and cute but realistically I hope they know that's just a waste of time and the only thing it increases are chances of a UTI.

I'm not a mom so maybe I just don't get it or get the struggle of trying to conceive. I'm not actively trying but not using contraceptives either. I'm just a wait and see type girl.

Am I being insensitively realistic?