Newborn babies need to be kept warm. So in cold weather, it can be easiest to dress your baby in layers. Then you can take layers off when you’re at the shops or in other warm places. As a guide, dress your baby in the same number of layers you’re wearing, plus one extra layer for warmth. Although it’s important to keep newborns warm, it’s just as important that your baby doesn’t overheat, especially during sleep.