It is best to wee-train after the baby is 15 months old, too early deliberate training may affect the development of the baby’s personality. At the earliest, do not exceed 6 months, because too small baby’s neck and back development are not strong enough, easy to happen accidents, what are the hazards of putting urine on the baby: 1, put urine easy to form dependence on the child, will increase the child’s inactivity. Artificially put the urine instead of the initiative of the child, is not conducive to the normal growth and development of the baby. Not only will it bring parents a lot of unnecessary trouble, but it will also put psychological pressure on the child and cause harm. Traditional urination can sometimes cause damage to the child’s hip bone or leave behind the problem of frequent urination. 2, the impact on the spine is relatively large, generally speaking, three months cervical curve formation, six months waist curve formation, premature urination may lead to scoliosis, hunchback, will have an impact on the development of bones, and even damage to the spinal cord. 3, frequent urination, will make the child frequent force clip on their own anal sphincter, ligaments are more relaxed, very easy to appear anal prolapse, if the stool is dry, there may be anal fissure. In short, young parents will always consider for the child’s body, think that premature urination will affect the child’s crest development, or to let nature take its course, but in this matter can not be rushed.