KAAV&KAMSI Baby Head Safety Protector is used for babies learning how to crawl, walk, run and it prevents them for, being injured when they fall; it has a squeaky sound that alerts the Mom. Our baby Backpack protector has a suspension retainer, a hollow vent ring, and an adjustable strap that stays put on baby. It is made of comfortable crystal velvet and 3D breathable mesh, and it is comfortable to use in Summer. Suitable from 5months- 3T