Why don't my babies like oxygen?

All this time you know, I've sneaking oxygen to them pretty much everyday. Sometimes I call it "fresh air", other times I refer to it as "polluted air". But they've been none the wiser their whole lives.

But oxygen through a mask? They think it's the devil. It's almost not even worth it to make them breathe it. Except that their O2 sat monitors are super loud and obnoxious, so it's in my ears' best interest to make sure they get it.

Hositals (and sick babies) are miserable.