Some of the 5 year programs are excellent, Dusquense in Pittsburg for one.
Typically OT;s do the undergrad, and then masters route.
In the end , no one really asks where you went to school, but rather, judge your level of skill....so go to a creditied school, try one in top 30 or so , if possible. If not go where you get best aid , or proximity etc. Masters same thing each school has a different focus , and I am not clear on all the details.
For peds OT it takes working in the area, taking extra courses after graduation . Experience is what takes you to becoming that OT. Look at AOTA that have a peds certificiate after graduation, where you need to take a certain amount of continuing education etc to add that credential to your name.
It is an awesome field, meaningful work.....good luck......well worth the work!