I only have to offer formula--- I don't take babies though.
Sight and sound supervision has ALWAYS been a reg here. Ever since I can remember. It is a PITA. As FCC I lined the kids up outside the bathroom, left the door open and we did songs and movement games while we took turns pottying.
They did give me a note allowing 'brief and necessary' restroom breaks. How kind of them.
As group, we have to have one with sight and sound and that usually means we potty when the kids do so they're lined up.
Noone is allowed alone with kids without a passed background check, even family 18+ with no contact have to have one every 5 years.