Firstly, Congratulations and God bless you and your new life. I really do see every child as a gift from God, and in my walk of faith saw that I was just too plain dumb to tell God how many children I should "allow" in my life. I always told Him, "you created them, I will do my best, but they are your problem". My wife and I had 15 pregnancies with 12 births. Those 3 lost are still in the grief of my heart. The 12 here are awesome. My parents who had 7 and adopted an 8th were once "counseled" by some neighbors over the horrors of overpopulation.
So I have some experience with answering those stupid comments.
Some of my replies to such bad mannered questions; Re # 1 "jeez, you must be the only human in our oversexed society that doesn't know the cause, are you stupid or did you grow up in a closet?
"I'm doing my best to pay your social security" "Just trying to keep us even with the Muslim's so we can remain a so called Christian society" "how many do you have, 1.7?"
One of my friends replies "we use natural family planning, it doesn't work, we planned for 12 and only had 11"
I did argue with UAW and GM people that voting democrat is just plain stupidly bad, economically. When you vote for abortion advocacy you are voting to kill future customers. Think of the number of cars we haven't sold because the customers are dead. I also had an interesting conversation with some teachers protesting for abortion rights. I first asked why they were teachers? I then acted confused, and asked "So why do you want to kill your jobs?" I mean, after all you can only teach dogs so much. Never heard of higher education for dogs. I also did a little math with them pointing out that the number of school closings was directly proportional to the number of abortions performed locally.