A 4-year-old child who urinates a little or can’t urinate every time he goes to urinate may be caused by psychosomatic factors, acute urinary tract infectious diseases, urinary tract stones, neurogenic bladder and other factors. 1. Spiritual psychological factors: the child’s psychological overstress or fear may induce psychogenic urinary frequency, may urinate frequently, due to less urine, when urinating, may not urinate or have a small amount of urine. 2. Acute urinary tract infection disease: for example, acute cystitis, which may be related to poor hygiene, due to hypersensitivity of the bladder mucosa, there may be abnormal performance such as incomplete urination and low urine output, accompanied by symptoms such as frequent urination, urinary urgency and painful urination. 3. Urinary stones: Bladder stones, for example, may block the bladder neck opening and cause irritation to the bladder, which may lead to frequent urination, but the amount of urine is relatively small, or there is no urine discharge, which may also be accompanied by symptoms such as difficulty in urination and pain in urination. 4. Neurogenic bladder: it may be related to hydrocephalus, brain tumor, diabetes and other factors, which can lead to damage to the nerves controlling the bladder, and may result in a small amount of urine not being able to urinate, and in severe cases, can cause urinary retention. A 4-year-old child who urinates a little or fails to urinate every time he goes to pee and for a longer period of time is advised to seek medical examination and treatment to avoid delaying the condition.