Y do I smell all a sudden?

I could go all day & wouldn’t smell but after having my daughter which is 1 now my vagina smells. It doesn’t smell like infection (I’ve had those before) it smells weird.. idk how to explain it. I’ll smell it on my underwear through my shorts sometimes... idk if I pee a little & maybe that’s why..? My underwear will be wet a little & ive assumed it was discharge but I’ve never had this problem & I have no new sexual partners.. 😞 what is this?