Age of use of the baby soft helmet: From 0 to 3 years (8 to 36 months), infants learn to crawl, walk and play to protect their head when the young child falls and prevent it from bumping into it. suitable baby head size: with head protection circumference of 43cm~53cm, the faucet can be adjusted to suit the baby's head, the weight is light and it is very soft.; Function: This toddler crawling bumper helmet can lessen the damage to the baby's head when the baby collided, reduce shock, protect the baby's healthy brain and keep the baby away from the head. And this baby hat is suitable for all kinds of weather, such as spring, summer, autumn and winter Baby hat materials: Front: cotton; Lining:; cotton; Filling: IXPE multifunctional foaming material. It is very soft, comfortable, breathable and light, but some young children do not want to wear it. Don't worry about it, baby will get used to wearing it after several days. The baby protective helmet protects your baby's intelligent brain and makes your family happy. Attention: This baby head protection cap cannot be used as a baby protective helmet. We therefore advise you to wear this helmet when riding a bicycle, electric or motor bike and playing outdoors. Be sure to wear this baby even child walking helmet. Please keep baby away from heat source and sharp objects.