If your baby has pain when urinating, urinary tract infection is the most likely cause. It is possible that the baby did not pay attention to personal hygiene, resulting in bacterial infection. It is recommended to use warm water to clean up every morning and evening, local with erythromycin ointment topical. Give the baby more boiled water can increase the amount of urine, play the role of flushing the urethra, if necessary with the choice of cephalosporin antibiotics, amoxicillin particles to the baby orally. Normal course of 3-5 days can play a significant improvement, do not need to be too nervous. The baby through the underwear every day to change and wash, in the sun exposure. If necessary, you can go to the hospital intravenous drip antibiotic treatment, the effect will be more obvious.