We never let my son sleep on his tummy until he was rolling and would roll himself onto his tummy.

Totally different story with my daughter though. She was so much happier on her tummy that we started letting her sleep on her tummy for day naps. I would still put her on her back for night sleeps, but then we realised how much better she was sleeping during her naps on her tummy, and decided to let her sleep on her tummy at night too. Her cot is 'side car-ed' to my side of the bed, so she's within arm reach at night. Like your DD, my daughter found her hands early and loves to suck the back of her hand while she nods off. She even has a permanent little hickie on her hand, lol. When she's on her tummy she loves to suck her hand to sleep, and she doesn't startle once she's asleep because her arms are against the bed.

We had her in a woombie or an ergoCocoon until she was about 6 weeks, and that's when she changed into a sleeping bag and started sleeping on her tummy.

She's now old enough that she can roll and tummy sleeping is meant to be "safe" now, but like you, I was nervous about tummy sleeping while she was little. But she was so happy on her tummy that we just let her do it with the baby monitor (and breathing alarm) turned on.

When my sister and I were born the recommendation was to sleep babies on their tummy, then when my first brother was born the recommendation was to sleep babies on their side, then less than a year later when my twin brothers were born (yep, mum had 3 babies under a year of age, lol!) the recommendation had been changed again to back sleeping. Not that I would recommend sleeping your bub on her tummy, just saying that it's your decision and I would never judge you because I did it myself