Er my 5 yr old DS seems to have stopped growing

[Pantone363]

Same size feet as last September

Not moved on the growth chart on his wall since then either, in 3-4 year olds clothes

Dd (2) is only a inch or so smaller

Just wanted to canvas opinions in case this is normal before I take him to the GP! Maybe he's just due a really big growth spurt?

Thanks

Ds is going to be 7 in feb and just gone up to an 11 1/2. My friends 3 year old dd is an 11. I just think how much I save on shoes. He generally just about manages a 1/2 size a year.