Nearly all childcare centres where I'm at are from 6wks old. When I worked in childcare tho I only ever had one start at 6wks, most of them started around 6mths. We get 12mths unpaid leave here though.
6 weeks here. NJ though, it's different everywhere
The younger, the more expensive, where I live. I saw one place that took kids as young as 6 weeks, but it was just a lady in a house.
6 months where I am from but It's different everywhere could be early as 6 weeks