Would put her in a longsleeved onesie then in a sleeping blanket. Dont believe she can role over yet, right? If not, I'd put a lint blanket across her legs, make sure to tuck the sdes under the mattress tightly so the blanket cannot move. You can touch the back her neck once she is asleep to see of she is too hot...if so, then remove blanket, if not, let her be. My son is doing the same. If you have heat, you could use heat and not se the blanket at all. I wouldn't but too many layers, unless her room is very cold, but in that case if you have a heater that would probably work better...make sure to check by touching the back of her next and not her hand or feet.