W.S.
Welcome to Maryland! I know a wonderful pediatric dentist down in Arnold, which is close by. His name is Dr. Tull. I find him and his staff to be prompt, caring and efficient. I do not know other docs out that way but......
There are great parks out that way so be sure to visit Quiet Waters, a county park on the water with great walking/biking paths and Sandy Point State Park on the Chesapeake Bay, where you can swim in the bay (but I don't recommend it after July, due to jellyfish), but it is great for sunbathing and for little ones who like to play at the waters edge. For a great day by the lake visit Cunningham Falls State Park, about a 90 min drive from that area. It is perfect for a mom with young kids, clear lake, soft white sandy beach, playground, picnic area, wooded picnic area and very nice bath house and snack bar. In fact all MD parks that have swimming have great bathhouses. To really see what we have visit our DNR web site (that is Department of Natural Resources in case like me you don't get all the acronyms).
Well have fun and welcome.