I was only talking about infants, and I thought Massachusetts's legal requirement of 3:1 was pretty common everywhere in the US, since one adult taking care of

I was only talking about infants, and I thought Massachusetts's legal requirement of 3:1 was pretty common everywhere in the US, since one adult taking care of 3 infants seems so difficult... but a quick search shows me it's not! 4:1 is pretty common as a minimum nationally, though. > And even high quality daycares might not help children potty train Definitely. I think that's pretty rare.