K normally sleeps in thick fleece jammies and a light sleep sack over that, but I always find him laying on his tummy with his arms tucked all the way underneath him. I think his arms or hands may get cold. When I finally got him down for a nap today I noticed he was missing a sock and it was a tad chilly. I didn't want to wake him, so I just laid a blanket over him. I just checked on him and he's all snuggled up with it, not sleeping on his tummy with his arms under him. It just looks more comfortable.
I'm thinking of going ahead and letting him start sleeping with a blanket.
Re: WDYT - baby sleeping with blanket at 7.5 months
yeah both of our sons started sleeping with blankets around this time, too. i couldn't imagine them sleeping without them.
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we let her sleep with a blanket when we stopped swaddling at five months old.