During your baby’s first few months, she will spend so much of her sleeping that you may decide to keep her in her PJ's both night and day. Fabric and fit are important safety considerations for clothing you will dress your baby in to sleep. The current Consumer Product Safety Commission regulations state that infants’ and children’s sleepwear must either be made of flame-resistant fabric, or fit snugly.
Flame-resistant fabrics will not ignite easily and will self-extinguish quickly in the event of a fire. If you get pajamas made from these fabrics, they can be worn either loose or snug-fitting. But the bad news is that in order to make fabrics "flame resistant," they must be treated with a formaldehyde finish. Formaldehyde is a known human carcinogen and not exactly the kind of chemical you want swaddling your newborn baby 24 hours a day.
Steer clear of flame-resistant fabrics and look for sleepwear that fits instead. Snug-fitting PJs do not trap the air needed for fabric to burnand they reduce the chances of contact with a flame. It is healthier and safer to choose snug fitting sleepwear for your baby ... look for those made from organic cotton that have not been treated with formaldehyde.
To prevent suffocation, the American Academy of Pediatrics recommends that you keep blankets out of your baby's crib until he is at least 12 months old. To keep your baby warm at night, try a wearable blanket, or sleep sack, like the Halo SleepSack (made from 100 percent organic cotton) to replace loose blankets in your baby's crib.