Agree with
@GoSpursGo on the MRSP program being a good option
Another kind of possible side option might be a fellowship with CDC. A lot of the ones for med students are shorter, some paid, some not. But the CDC ORISE Fellowships are longer 1-2 years and paid, not just for med students but people at varying levels so I don’t know how often med students do it. Each posting has different degree requirements ranging from completed bachelors to post doctoral.
The fellowships range from wet/bench lab research to bioinformatics to population/epi to education and policy. Some are more basic or translational research some are more grunt work or non-research so you’d need to read the listing carefully and ask lots of questions when interviewing.
There a lots of different options and new ones are added all the time, start dates vary throughout the year.
Since you’re interested in neuro and peds you could choose a project on a neuroinvasive infection like enterovirus D68 or acute flaccid myelitis which would have relevance to peds, or meningitis, syphilis (congenital is kind of a big thing now), malaria, or maybe even some of the vector borne diseases, childhood lead exposure, toxicology. There are some stroke projects usually listed. Might also be some occ health, prev med, injury prevention, or mental health project options that tie in with neuro as well.
We have a variety of hands-on, short-term internship programs for medical students and residents. All offer a unique experience in one of many public health fields
www.cdc.gov
Listing of current research opportunities at the Research Participation Program that offer hands-on laboratory experiences and internships for university students and faculty in support of department's mission.
orise.orau.gov
stroke example
Zintellect - Climb Higher
Another thing would be to look into psych opportunities that are more neuropsych.