My baby is 11 weeks and has not urinated for over 6 hours and his penis is swollen. he also had his 10 week vaccine 6 days ago. should be worried and take him to the hospital? or wait? what could it be?

Monitor temperature: Encourage feedings and you may supplement with sterile water or infant electrolyte solution for one day. Monitor his temperature, and report a temperature of 100.4 or higher to your pediatrician. The swelling may indicate local irritation or a more serious infection. Please have a urinalysis completed and contact your pediatrician.