How do you convince parents to give you your hidden birthday present early?

well, first of all make a conversation with your parents then bring the present thing up if that doesn't work well, then try to look for it unless they still haven't bought well then your looking and wasting your time. Finally if the two suggestion don't work well, then you should wait and let it be a surprise you now its not bad waiting and letting it be a surprise. :) HOPE THAT HELPS.