Used these on my newborn up to 2 months. The elastic is smaller thus having a tighter fit around those small wrists without being constrictive. With other mittens we've tried, the elastic is too loose; the mittens end up looking like oven mitts on the baby. For some reason, these are so hard to find at Walmart and Target. I bought mine here and at Ross. At Ross, I buy their entire stock (< 5 pairs) and give them away as gifts since my baby no longer needs them. I've had one new mother praise how these are the only ones that stay on her newborn, too.