Sleeping on tummy

My daughter is 6 weeks old today. As of a week ago we transitioned her to her crib. She was sleeping in our chest as it was the only way for any of us (myself, my husband, and daughter included) to get any sleep whatsoever. It's been great having my baby girl in her crib, but the only way we can get her to sleep for any extended period of time is to have her sleep on her tummy. I know "back to sleep" is what the professionals recommend. Does anyone else put their little one down on their tummys to sleep?