Hi, Molly. It's hard to tell without the whole sentence, but I imagine it's something like what I found in this site:

http://www.wvhealth.wvu.edu/clinical/peds/doctor.htm

What is a pediatrician?
A pediatrician is a child's physician who provides:

preventive health maintenance for healthy children.
medical care for children who are acutely or chronically ill.

In this case, I'd say "Un pediatra es un médico de niños que presta servicios de medicina preventiva para niños sanos y brinda atención médica para niños enfermos". As you see, there are two translations for "provides" in this paragraph, so it's really necessary to know the rest of your sentence.

Hope this helps,

Andrea