Re: Not happy, can someone advise me?
I would try them on LO first, but if they are for sure too big (which it sounds like they are!) then send a polite message to the lady saying that you weren't sure if she added some inches so he could get more wear out of them, but they are too big and you don't think his measurements are going to increase much from the ones you gave her in the time he will be wearing them.
It's better for her if you tell her about the issue, so she doesn't make the same mistake with future buyers.
C, British Expat, Wife to A, Mama to DD & DD2