The best time for tear duct probing is usually when the baby is 3-6 months old. This is because the residual membrane at the end of the nasolacrimal duct of the baby’s tear duct is still relatively thin during this period, and the inflammation of the tear duct is not very obvious, so it is more effective to perform probing. When the baby’s tear duct obstruction is found in the early stage, conservative treatment methods can be chosen, such as massage of the tear duct area, tear duct irrigation, and antibiotic eye drops. Through the above conservative treatment, some babies can return to normal. If the effect is not obvious after the above conservative treatment, then the tear duct should be probed when the baby is 3-6 months old. If there is no obvious inflammation and adhesion in the baby’s tear duct, probing is more effective. If your baby’s tearing symptoms are more severe or if there is a lot of discharge, you can also move the probing up to around two months of age. If the baby is too old for tear duct probing, the effectiveness of probing may be compromised by a thicker tear duct remnant membrane or more inflammation of the tear duct. Therefore, parents should take their babies to the hospital in time for early detection and early treatment.