“Why does my baby urinate every hour?”

If this degree, i.e., every hour, of voiding is new, watch if he shows any additional related symptoms like "hurting or straining/pushing before/during peeing, any change in body temperature, etc." Nonetheless, if a new thing to the baby, he needs a preliminary professional evaluation so as to decide if he may have UTI or bladder dysfunction, etc. To assist you to be more knowledgeable and helpful for the potentially upcoming care, please take the time read "Sick? What To Do?" at http://formefirst.com/eNewsletter06.html. Besides, you may sfit through some life-/urology0related pages in www.formefirst.com. Best wishes for good medical care of the baby and Happy Holidays 2020.

Yes. Before an individual develops voluntary control of his/her bladder, usually around age 2-3 years or later, the bladder automatically contracts to expel urine when it reaches its capacity. For a 4-month-old, that capacity is tiny, and so the baby urinates very frequently.

Shelley C. Springer, MD, MBA, MSc, JD, FAAP