You will need some basic bio/chem and physics classes. But each medical school has it's own requirements- look up the reqs for where you think you want to go. When I was applying ( in the dark ages:) The one that would have stalled me if I had decided to go there was U Minnesota had a requirement for 3 college lit classes.- I love to read, but as a double science major, had not done even one (I took one my senior year as I was applying- and would have used summer school to do the other two.)
Both when I was at school, and a lot of the students I work with now are not science majors. Once you have your basic classes- think about the major that fits you.-
- a child psych / dev class would also be useful.