Is this normal?

My sons childcare centre has a new director, who has decided to rotate the room teachers on a regular, ongoing basis. So he might have the same teachers for 1-2 weeks, then it changes to new ones.

Currently its changed on an annual basis, and children who are moving up to the next age group/room will usually have one teacher in there that they're had before.

Is this constant rotating thing normal? Is it evidence based?

As it is, DS gets upset if on of the regular teachers has an RDO, I just don't know how he'll cope with this!

All of the staff I have spoken to are not impressed, and have encouraged parents to complain about it.