P.W.
B.,
What was the shot and when did the baby get it? Was it an antibiotic? And how long did they say it would take to work? Does the baby need follow up antibiotics?
Call the hospital back and speak to a nurse. There are a couple of things you could ask.
There are drops the pediatrician can prescribe that you put in the ear and they numb the pain. They may prescribe them over the phone.
If your baby just got home and the shot hasn't had a chance to work the drops may help but you also may be able to give baby motrin. Ask the nurse how to proceed? Motrin may last longer and work better than tylenol, but be sure the baby has food on his stomach as motrin is harder on the tummy. If you really need it (you don't want to over medicate) you may be able to give the tylenol, wait 3 hours and give motrin, wait three hours and give tylenol again. That way baby is only getting the same med every 6 hours. In my experience tylenol only last 3-4 hours. BUT YOUR BABY IS VERY YOUNG, SO PLEASE CHECK THIS OUT WITH THE DOCTOR BEFORE DOING IT.
If you can't get through to the hospital, and don't have a pediatrician, then go to a walk in clinic if you can afford it. If you cannot afford it keep after the hospital and whoever treated you to get answers.