The skin is the most widely open and largest organ of the body to the external world, and the skin epidermis is the first line of defense against external aggressions as a protective membrane and the last barrier between the body and the external environment. Infant skin does not fully reach adult structure until about three years of age. Moreover, the density of skin fiber bundles and the total thickness of the dermis are lower than those of adults. One, due to the weak skin barrier function, infants, on the one hand, easily absorb water, moisture content is higher than adults, so it looks watery and tender; on the other hand, the loss of water is also accelerating dryness, increased scaling, and even peeling. This is when the baby will appear: irritability, hand and foot tongs scratch, sleep restlessness. Second, the baby’s body surface area is larger than that of adults, so the heat dissipation surface is also large. The sweat evaporated from the pores is twice as much as that of adults; it is easy to absorb external substances, and at the same time, the reaction to allergic substances or toxic substances is much stronger. Therefore, when we choose skin care products for babies, we should try hard to find some products that can moisturize the skin and block certain microorganisms in the external environment from invading the skin and absorbing certain chemicals, so as to wrap the baby’s skin with an invisible, safe protective film with dual effects. Third, after birth, the number of sebaceous glands in infants has basically reached the number of adults. The physiological basis for sebum secretion in infancy is more vigorous, forming seborrheic dermatitis. Some infants with yellowish greasy scales and scabs on the head and face should first be cleaned with emollient lotion applied to gauze or paper towels to wipe away baby wash. Fourth, the number of sweat glands per unit area of infants is higher density than that of adults, so infant skin is easy to sweat in warm and humid conditions; however, because the sweating center is not yet mature and unstable, sometimes skin scales can block the ducts and affect the sweating function. Generally, they start to have normal sweating function in 5-6 months. V. Skin folds: often due to sebum and sweat impregnation, PH is acidic, which can easily cause Candida infection (local dampness, flushing, white membranous material). Therefore, we should use natural plants every day to make clean moisturizing and both natural anti-inflammatory essence of the skin cleaning lotion, emollient lotion, talcum powder and other special products for babies, invariably add a layer of baby skin with a protective film to prevent skin Candida infection six, the physiological functions of the skin: the skin has protection, absorption, secretion, excretion, feeling and regulation of body temperature and other physiological functions, but also involved in a variety of substances Metabolism, and is an important immune organ, so that the body to maintain a stable internal environment. Babies’ own immune system is not yet perfect and their resistance is weak, so they are more prone to skin allergies, such as erythema, rash, papules, blisters, and even peeling skin. Therefore, you should stay alert to avoid irritation of your baby’s skin. Therefore, we should pay attention to the following points when choosing skin care products for babies: 1, avoid contact with some irritating or sensitive substances in the environment; 2, avoid the use of alkali-containing, crude cleaning baths and soaps; 3, appropriate use of natural moisturizers after bathing; 4, dry skin given natural moisturizing products; 5, reduce friction between the skin, skin and clothing, the use of pure cotton, soft, easy to absorb water 6.reduce the absorption of chemical products in the environment, the use of natural moisturizing skin care products.