Between the ages of 4 and 11, the hydrolipidic film of children's skin is under construction, it is more vulnerable to external aggressions and is 3 times thinner than that of an adult, therefore much more fragile. The dermis is immature with small and spaced-out cells that intensify the insensible loss of water and dehydration of the child's skin, which is why they need daily hydration and protection. The sebaceous glands, which help to create the hydrolipidic film and combat dryness, are not very active.In summary, children's skin is therefore particularly sensitive and fragile and requires daily moisturizing and protection.