My kids are about the same age as yours and we're in Arvada. We've been going to Mountainland Pediatrics at their small practice with Dr. Karen Yocum for the past few years. The kids always see the same receptionist, Joyce, which helps with the safe, comfort feeling. It's great, just like the pediatrician's office SHOULD be.
They are very professional, attentive, caring, and they remember us by name when we walk in the door. You can call in with questions or concerns and a nurse or Karen will answer your questions personally on the spot or within a couple of hours at the most.
We drive 20 minutes to their small Louisville practice, which I take US-36 to the McCaslin/Superior exit and head towards Lousiville, take a right turn on either Via Appia or S. Boulder Rd.
Their address is 335 S. Boulder Rd., Louisville, CO 80027. If you call you'll most likely meet Joyce who is wonderful - phone ###-###-####.
There's a closer and much larger branch of Mountainland Pediatrics with a number of rotating doctors located in Thornton, but it's worth it to me to drive to Louisville. I've been to the Thornton office twice in the past and it's not the same experience at all. That location is 8889 Fox Dr Denver, CO 80260 - phone ###-###-####. (Denver address, but just off 92nd/Thornton Pkwy.)
Hope you find a place that suits your family!