I have a 10 day old baby weighing 6lbs 10 and so I am using sheets and blankets right now, but I have been given a number of sleeping bags which I want to start using asap. How older how much must she weigh before I can start putting her in them? Also most don't say how many tog, but all quite quilted as similar so do I assume 2.5 and just right with asleep suit for winter if room is approximately 17/18 degrees?
Most of the sleeping bags I've used were suitable from 7lbs. Both mine were over this at birth so I think it's a size thing rather than age. Just check the labels carefully,they may do bags for babies under 7lbs or you may have to wait a few more weeks
Depend on how recent they are. When I had ds1 four years ago, the smallest official grobag size was the 0-6m from 10lbs one. More recent ones are 0-6m from 7lbs, and they tend to have poppers on the underarm section to effectively narros the armhole. This prevents the baby falling down inside the bag. If your baby is large then they'll be fine from birth but I'd wait till at least 7lbs, and 10lbs if you think they are older bags, or without underarm poppers.