Baby peeing and crying may be a normal phenomenon, or it may be due to pathological factors such as urethritis, circumcision and other diseases. 1. Normal phenomenon: the child is too small to communicate in words, it will express itself by crying, so the baby peeing and crying may be a normal physiological phenomenon. 2. Pathologic factors: (1) Urethritis: bacteria such as streptococcus can lead to capillary dilation, paraurethral glands are congested or filled with heaps of pus cells, which will lead to pain when the baby is peeing, and he will cry. (2) circumcision: due to the male baby foreskin package usually do not pay attention to clean, triggered by circumcision, leading to germs upstream infection, can stimulate the mucous membrane of the bladder and nerve tissue, triggering pain, the baby cry when urinating phenomenon. Baby crying when urinating may also be caused by other reasons, if the symptoms of baby crying when urinating appear, continue not to relieve, need to seek medical treatment in time.