Is there a 'best' age to change a childs primary school?

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Hi Im new to this so please bear with me.
My daughter is currently in Reception at a private school and we are considering moving her to a different one (also private). However I am in two minds about whether to move her this coming Sept (going into Y1) or leave it another year. I would like to leave her for another year but am a bit concerned that she will have formed stronger friendships by then and find it more difficult to settle somewhere new.
Any ideas??

Depends on the child and a whole host of other factors that you cant really control. Friendships will be stronger if you leave it but your dd will still be young enough to adapt easily , also maybe more mature and better able to understand the move. Ive just moved a very shy child in year 2 and she has been fine. good luck