M.W.
Try Children's Corner Nursery. They have programs for infants upto pre-K. My son, now 17 months, has been there since he was 3 months old and I've been very happy with the program. They are located in the Hutchinson Metrocenter Complex in the Bronx. They also have several locations in Westchester, inlucding one in New Rochelle. I believe the program for older childern is academically oriented, but you can find out more on their website at childrenscornernersery.com. They offer programs that are five days/all day. But I know that there are opitons to do fewer and/or shorter days.
Good luck.