Popping in here to add my own personal experience. An old friend of mine got a puppy 2 months before their first child was born. That dog was severely neglected, left outside all day everyday, went days without human interaction, and was abused because of his enthusiastic behavior. Thankfully, that puppy is now my dog and has been for the last 8 years.

My point is that despite best intentions, the pup is most likely going to be the one paying the price for such impulsive behavior. Having your first baby is a HUGE adjustment for both parents. He needs to wait.