Sleeping on tummy

Chloe slept on her tummy for the first time today. She's become quite the expert at rolling over and now that she's in a crib with nothing to block her from moving around, she's been all over the place.  For the past few days, she's rolled over on her tummy and was unable to really roll back so she'd start crying and we'd have to rescue her. But this morning, she actually fell asleep on her tummy and slept for 2 hours in that position!  A said she looks like me sleeping (minus the drool of course).