DH and I would like to change DS's surname to be our two surnames double barrelled instead of just DH's. But will this saddle him with all manner of paperwork nightmares in his adult life whenever he wants to apply for something? As much as I'd love him to have my name too (blaming sleep deprivation for not doing it at the time!) I don't want him having to deal with lots of extra faff for the rest of his life!