C.M.
I wasn't crazy about my OBGYN in Denton, but my kids' pediatrician is Dr. Van Maele with Cook Children's off Bonnie Brae and she is wonderful!
Cross Roads and Denton both have public preschool. You do have to qualify and live in the Denton ISD to attend. You can also pay ($600 full time and $340 half day) and then you may not have to be in the ISD in that case.
There are several great private preschools in Denton, depending on what you are looking for.
Children's Corner is full day and half day
Cornerstone cooperative is half day and you help
Children's Place is half day with the option to go until 2 (both my kids attend)
Immaculate Conception is full day
Selwyn is full day
There are a couple Montessori schools, too
Message me if you would like more info!