Mila started rolling from belly to back at four weeks. Back to belly is still a long way off. My two year old rolled belly to back at two months and back to belly at four months or so.
Mine isn't rolling yet, he rocks himself back and forth during tummy time in an angry manner lol but he hasn't learned to tuck his arm so he can roll... I've been putting him down more and more to encourage it though!
He rolled belly to back at 6.5 weeks a few times, but he hasn't done it since. DS1 did the same - rolled at about 6 weeks, and then started doing it again and often around 8.5.
DS rolled back to belly at 3 months and it totally sucked because he'd do it at night and then screeeam his head off. I'd go in, flip him back over and I'd be lucky if I got back to my bed before he did it again! We ended up having to use the magic sleepsuit just so he would stop rolling at night. Belly to back took longer for him.
DD isn't even close.
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Re: rolling over
DS rolled back to belly at 3 months and it totally sucked because he'd do it at night and then screeeam his head off. I'd go in, flip him back over and I'd be lucky if I got back to my bed before he did it again! We ended up having to use the magic sleepsuit just so he would stop rolling at night. Belly to back took longer for him.
DD isn't even close.