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Keep talking.Thats the only way they will get it.
What do the caretakers do when he cries ?Do they give more attention to him.I talked to S class teacher asking them to give her more time for a day or two that one worked.She was totally fine by 3rd day.Does he calm down when you leave or he keeps crying till you get him back .
And also ask about some classmates name and talk to him about them.
I think crying will be there for a week and after that it will stop.