Bruce Park in Greenwich, CT...I've seen it myself and I have had friends tell me the same thing, always nannies there that do not take care of/watch kids. Last yr I sat under pavilion, saw nanny with infant girl in stroller sit for a good 30 min and didn't even look at her. Little girls was just moving her little arms and legs, as infants do. It was sad. This past week little boy near swings, a lady helped him on and he was on for 20 min and same women helped him off while nanny sat nearby and then was like "oh I was watching". Wtf?! As a mom I would never sit on my ass and let a stranger take care of my kid and then say oh I was watching.
If you have a nanny in the Greenwich area and you know they go to Bruce Park I would recommend doing some surprise visits if u can.