I've always let K take a nap or two on my chest each day since she seems to sleep more peacefully that way. This week since I'd suspected and confirmed acid reflux, spitting up, and thrush, I've been letting her sleep on my chest/tummy every night for the better part of the night. She sleeps longer and deeper that way for sure. The pediatrician said I could let her sleep on her tummy, but I'm still scared. I tried putting her on her tummy finally in the bassinet so I could use the restroom and she ended up squirming like she wanted to crawl! So I'm back to being her bed. I partly don't mind because she's just so cute and snuggly and it's the sweetest thing when she wants to use my boob as her pillow! Lol! But am I setting us up for bad sleeping habits down the line? If you have a tummy sleeper, when did you start letting her/him sleep on their stomach?