shared bday...

so i have a 1 year old and pregnant with my 2nd and its due to be on the same day of my 1 year old.. I know theres still a chance it wont be same day but itll be within the same week or 2 more than likely.. Im worried about how their birthdays will be in the future, i dont want people to show up for one and not the other and i dont want either of them to get the short end of the pole or be conpared.. I know we could always do dual bday parties but what if they want different places or dofferent themes? it just doesnt seem fair to them, they didnt chose it this way you know? What would you do in these situations? I know its super early to be worried but im a worrier and a planner and i want the best for both babies!