Nervous bit excited

My wife gave birth to our son 6 months ago and we just found out tonight that baby #2 is on the way. I'm excited about being a dad again but nervous with them being so close in age. We wanted another baby but wanted to wait atleast a year and a half. We weren't trying but weren't using birth control so we knew it could happen just didn't expect it to. Any other dads have kids so close together?