I'm not sure about in-home, but all licensed providers in DC do.
A group of us is working to advocate for updating COVID-19 daycare policies to enable optional masking for children and decrease the crushing burden on families. Please see below for our advocacy guides and petition.
DC daycare advocacy guide:
https://tinyurl.com/57sapzjy
Montgomery County daycare advocacy guide:
https://tinyurl.com/yd2jr5pu
Petition:
https://chng.it/vTzRTQKGHf