Close birthdays

❤️🐘Kim🐘❤️
Anyone have children with birthdays in the same month.. More specifically close in date?
How do you handle celebrations?
LO isn't due until 8/11 but has shown signs of not holding out until then. My stepsons bday is this coming Wed. I'm nervous baby may come very close to his bday. 
It's already difficult dealing with his mother and trying to plan things. I could only imagine how difficult it would be having the kids share close birthdays. (Her and I are cordial but don't necessarily care for each other)
Moreover, I would want individuality between the two. I myself would hate to have to share a birthday/birthday weekend with my sibling lol
For the record this is absolutely nothing personal against my stepson. Just wondering from those who have children with close birthdays... What do you do? How do you celebrate?