Many infants soon after birth on the tears, secretions more, many parents think it is “on fire”, drink more water will be good, in fact, not, normal two months within the child is not tears, in the crying does not tear, two months slowly in the crying will be tears, but do not cry not trouble when it is not tears. Tears in infants and young children are not “on fire”, but nasolacrimal duct obstruction, that is, the eyes of the “downpipe” obstruction, part of the self-cure, but very often need to go to the hospital for the tear duct flushing or probing the tear duct treatment. The optimal age for tear duct flushing is 2 months to 5 months, but infants older than 6 months will cry more during the operation, and the tear ducts will be in a state of inflammation for a long period of time, which is easy to become inflamed and is not conducive to healing. Therefore, it is recommended that infants and young children with tearing and excessive secretion, if conservative treatment is ineffective, it is best to go to the hospital for treatment between 2 months and 5 months.