UD Q

What weight range does a UD M/L go up to?

I have no idea what Katie weighs but she's wearing 18-24 months clothes and fits in M/Ls still. TBH weight range really isn't a good guideline for measuring for cloth nappies though. You're far better measuring waist, rise and thigh to work out what size you need. The UD size chart is here.

Do i just measure hip to hip for the waist and bum to belly button for rise sorry havent a clue Do i do it without a nappy on?

Not sure but the M/L is pretty big, Gracie wore her on the tightest snaps but am selling them on as the legs were just too big. x