Congrats!!!
Yes, he will affect the project completion date. Envision...late night feedings, changing diapers, crawling all over the place, putting socket covers in your dedicated 20 amp outlet so he can't jam a screwdriver in there, moving chairs from the dining room table so he can climb up on top of the fridge, Kool-aid stains on the couch, discovering that he actually can pee off the top of the stairs, putting huge scratches in your brand new suburban as he cruises by on his razor, putting your airplane money into his 529 plan, telling him to quit throwing baseballs against the garage door...and so on.
BUT, I will tell you what...it is all so worth it when they come up to you with open arms and say...I love you daddy.
There is nothing more challenging or rewarding then raising children. Congratulations Greg. You WILL love every minute of it. The plane will get done when it gets done.