What should I do? Confused.

I'm a FTM and have to take my son to see the pediatrician asap. The thing is when called my insurance to add him they want his birth certificate and social security card and a few documents from hubby and I. While that is still in process I have to pay out of pocket. I contacted two pediatricians they want payment upfront at the time of visit. They both charge around the same price one is $200 and is $150 with a payment plan is $75 the one that cost $200 is closer to my house the other is the next town over so I'm not sure which one to pick I can't afford either