What can I do to make his birthday special 😕

My son is turning 4 on June 26th & I rely want him to enjoy his self the problem is money we just moved in to our new house and just getting settled and paying all the new bills not to mention I’m due August 1 and we still have quite a bit to get (wipes, pampers, swing, car seat!) but I do want to make his birthday a good one I’m feeling so down our oldest daughter just had her birthday this past April and her grandma helped out alot(we also had more money) & she got a nice party and some good gifts & a bouncy house I’m rely feeling bad that it might not be as good Bc of our financial situation 😖💔 we’re still doing a party for him but I don’t want him to feel bad that it’s not as big as his sisters it rely sucks any advice on what I can do to make sure he has a good birthday ?