The skin is the biggest organ of the human body. Children's skin is producing more keratin than the one of babies but until 12 years old, the skin is still vulnerable because it has not reached its maximum of protection. Keratin is a protein which protects the skin from external pollutants. Children’s skin is thinner than an adult; it is more likely to absorb chemical products. It is important to choose a gentle cleansing product which respects your baby's fragile skin.