Mt. Kisco Medical Group near Northern Westchester Hospital has a terrific pediatrics group (we have Dr. Jill Ratner). The office is super efficient and pleasant, it's easy to get a same day sick appt and they have weekend, evening and holiday hours as well. Can't really speak to the vaccines as we moved here after my kids had already had most of them. Our previous doctor was in Santa Monica (the liberal bastion of West LA) and I had to argue and argue for even minimal spacing like one vaccine per office visit - go figure.