Koozer burps a lot, but thankfully he doesn't fart. It's hilarious when he has a toy in his mouth, like the Kong or Kong Genius, because when he burps, the toy acts like a megaphone...I laugh every time.
Emma does quite a bit. Mostly she does it when she's been playing with a toys, chewing a bone or finsihed drinking water. I chaulk it up to too much air. She can belch like a sailor though.