Second vac after Covid

[OhCobblers]

Is sticking to 12 weeks after Covid for second vac, for a 15 year old still the thing to do? I keep seeing 4 weeks? Has it changed or have I read it incorrectly? Thanks

It's 4 weeks for adults, 12 for children.

Thanks @JanglyBeads
Just wondering why I'm reading 4 weeks for some and what the risks are?
So much differing info!!

4 weeks for some children I've read

Only for the clinically extremely vulnerable.

I stuck to 12 weeks for my child. I'm not sure what current advice is.