My 5 month old pee smells like acid?

Urine odor: Generally speaking, we don't necessarily have to be concerned about the odor of our baby's urine. In the absence of any other symptoms (ie: fever, vomiting, poor feeding, irritability), there is no cause for concern. The best test of course is a urine sample obtained via catheter to be sent for urinalysis and culture. But, as mentioned above, in the absence of any other symptoms, no action is nece.