DS is 7.5 months and very mobile. He rolls both ways and is almost crawling. Tonight he was all out of sorts and worked up before bed (who knows why ) so he got hot and I took off his sleep sack. I finally got him to sleep and I put a crocheted blanket (loose weave) over him in the crib. I'm pretty comfortable with it, but I'll probably keep using the sleep sacks.

I've read that you're not supposed to do loose blankets until after a year old. Not looking for advice, I'm just curious, what age did you start using blankets in the crib? Any special reason?