What courses would be best to take in college to become a pediatrician?

You would need to take science classes like biology and chemistry classes. This would prepare you for medical school.

Math and science classes are needed in college to get into medical school . You should talk with a college councilor and they can usually recommend the required courses.

You also need to be aware of "where" you are taking these classes. Some medical schools prefer that you take any pre-requisite classes in an university instead of community college. Said that, it is ok to take those remediation and very beginner classes in a community college but then you need to transfer to a good university so you can take the more advanced science classes.
It is very competitive. Some doctors have a Bachelor's or even a Master's in biology, chemistry or some other science course that builds up to the medical knowledge they acquire in medical school.
Check the requirements in the medical school you'd like to go. They have a degree plan that should help you. Research about the qualifications and talk to an academic advisor or instructor to get a better idea. Since it will require a lot of studying and a lot of money (even if you get student loans), it is best to get the info directly from the places you intend to apply and become familiar with their selection criteria. Last but not least, be prepared to some serious studying. It will require dedication but it is very rewarding as well. :)

Agree with both of these professionals . You will need to be pre-med as well as volunteer in the medical field. Competition is tough to get into a US medical school , you will need to be close to a 4.0 . Being a pediatrician or any medical/nursing career is incredibly rewarding and gives back to society.