It is not normal for a newborn baby boy to have blood in his urine. First of all, we need to see if the child has a congenital urinary tract infection, if it is a urinary tract infection, most of the cases of congenital developmental abnormality of the urinary tract, that is, congenital developmental malformation. In addition to routine urinalysis, it is necessary to carry out ultrasound examination of the urinary tract, mainly to determine whether there is no ureter, bladder and other developmental abnormalities. If the abnormality is in this area, surgical treatment is needed. If there is something red in the diaper, you should consider urate crystals, which are not necessarily abnormal and are normal in most cases. This condition is not necessarily abnormal, and most of the time it is normal. It is related to the fact that children drink less water when they are born, and some metabolites in the body can not be eliminated from the body, especially the deposition of uric acid salts. After drinking more water, this situation will be significantly improved.