You can’t be sure he will unless he gets gifts, right? Isn’t that what birthdays are for? I’m kidding, mostly. As a dad of two – there’s probably nothing that could make me forget.
Regardless, get him something amazing to share the celebration. And no, getting him a baby doesn’t count.
You’ll want plenty of memories captured in the years to come, and it all begins with this moment. How much of the process you want on camera is certainly up to you.