Kids Hot Water Bottles come with 100% Polyester covers. Perfect for cuddling on cold, winter nights or when tummy ache strike. At Children’s Rooms we are often asked whether or hot water bottles are safe to use with children and toddlers, the answer is yes! As long as there is an element of supervision. Whilst they are great for keeping your child toasty, they are not a toy. We personally find hot water bottles as a brilliant way to relax and keep your child warm in bed, with the soothing effects of the heat helping them get to sleep easily and quickly as they grow older.