Swaddle blankets usually come in soft cotton which is a breathable material, and babies may enjoy the touch without getting overheated. In this case, you can choose some blankets designed with viscose materials extracted from bamboo. They have excellent heat retention capacity and they can keep your baby cool during night. However, babies may get overheated sometimes due to high room temperature. You may check for such signs and may take necessary steps as required. Some of the signs that may indicate that the baby is overheating include baby crying, pushing the swaddle blanket and trying to free itself, sweaty hair and face, flushed cheeks and rapid breathing. All these are the signs that your baby needs to get out of the blanket.