If she can roll on her own and lift her head it's ok. But if she can't it's extremely dangerous

My youngest slept on her belly for the first month & a half & for that month & a half we slept on the floor with my my hands touching her & I intentionally laid uncomfortably so I woke up to every move she made. We used the boppy pillow to prop her up a bit & I would keep a hand by her face & one under her bum to keep her still. She had horrid belly problems & it was the only way other than laying directly on me that she slept & I was too scared to have her on my chest. It was horrible & im definitely not proud of it nor will recommend it to other people. But I will always admit to it because I had to accept that I needed rest at some point, that’s nature, so I did what I had to do. The minute I could get her comfortable on her back though, she was flat on her back. The swaddle me blankets are honestly what helped the transition.

I know they sleep better but it’s not recommended because they can’t roll back over god for bid they can’t breath I feel your pain my kids hated back sleeping but I would try a swing over stomach sleeping

My second always slept on her stomach but kept her in the bed till she was about 2/3 months n put her in her crib shes fine just check up on them here n there

Both my kiddos were tummy sleepers but both were also rolling not even 2 weeks after leaving the hospital.
My youngest actually rolled while still at the hospital 🤣

I highly suggest you keep baby sleeping on their back until they are able to roll over on their own .