All parents must pay special attention to children’s Sleep Safety
There is no official age that has been deemed 100 percent safe to use a blanket, quilt or comforter, according to the American Academy of Pediatrics (AAP), but most medical experts feel that soft bedding poses little danger in the crib to healthy babies after 12 months of age and ideally when they're 18 months or older. So, it is better to hold off on covering your baby with a blanket at night or during her naps until she’s at least 18 months old since she could still become tangled in it when she's younger. After 18 months, a thin blanket/comforter can be used and may even become an important part of the tuck-in routine.
Your toddler can start sleeping with a pillow when he starts sleeping with a blanket — at age 18 months or later.
Blankets can be dangerous if an infant’s head gets covered when he or she sleeps and may cause suffocation or SIDS, stated by HealthyChildren.org:
“Keep soft objects, loose bedding, or any objects that could increase the risk of entrapment, suffocation, or strangulation out of the baby's sleep area. These include pillows, quilts, comforters, sheepskins, blankets, toys, bumper pads or similar products that attach to crib slats or sides. If you are worried about your baby getting cold, you can use infant sleep clothing, such as a wearable blanket. In general, your baby should be dressed with only one layer more than you are wearing.”
You may also read the “Golden Rules” of children’s safe sleep tips by visiting: https://www.canada.ca/en/health-canada/services/safe-sleep/safe-sleep-tips.html