My daughter is in the 2 year old program at Potomac Nursery School and we've been very happy. They're really flexible in terms of how many days and before/after care hours you want. We toured 4 different nursery school/daycare centers and this one was our favorite. I'm an elementary teacher in the county and have been very pleased (my husband said I was a tough critic because I'm a teacher myself, ha!)
http://www.potomacnurseryschool.com/pdf%20forms/2015-2016_Application_For_Admission_PNS.pdf
http://www.potomacnurseryschool.com/
They don't offer infant care though... our 14 month old son is at an in-home daycare about a mile from Potomac Nursery School (where our daughter went before we switched her). We've been very pleased. Her name is Mary and she's off Wotton and Falls Road. Her number is 301-605-4942.
Good luck in your move and congrats on your new addition to the family!