when do you think your baby can have a blanket while sleep?

Sometimes I worry my baby could get cold at night,doctors tell you don't to put any blanket in your baby's crib.I swaddle my baby until she was 3-4 months old.She just turned 9 months and Im thinking about it.

Moms Expertise
    Nina's used blankets since the first day we brought her home. I always keep a close eye on her to make sure she doesn't pull it over her face or anything, which she never has, but she likes her blankets. Even if she doesn't use it as a blanket, she likes to hug them in her sleep, or just have one hand holding onto it for comfort. Our doctor had said that pillows and crib bumpers were a no-go but that blankets were allowed with close supervision.