Most of the sun can not sun navel refers to infants and young children, for adults do not have a significant impact. Because infants and young children navel area is not completely healed, and with the internal organs directly connected, sunbathing when the sun navel, easy to lead to localized cold stimulation and induced infant indigestion or gastroenteritis and other diseases; at the same time, infants and young children navel part of the skin is more sensitive to strong sunlight irradiation is easy to lead to sunburn, resulting in unnecessary injuries. Adults sunbathing in addition to the navel area has broken or skin infection, skin allergies, there is no obvious contraindications, can be appropriate sunbathing. It is recommended that infants and young children sunbathing to do a good job of local protection, such as eyes, navel, etc., to ensure that sunbathing safety.