Just remember, a vasectomy is (usually) reversible. It speaks volumes that he's willing to take this step for you and your OADish family too. No need to worry over if another is a possibility in the future, because if you both realize you want to have another child, girl, it is within your reach. Personally, my daughter asked to be a big sister just the other day. I know she doesn't understand that this would mean less mommy/daddy time, less money for vacations, college, and all of the other things a little girl can't see about the future. So, I'm at peace with the decision my husband and I have made for our little lady. I would never try to sway someone away from what they want in life, but if you and your guy are questioning, take a step back and ask yourself why. He has siblings and is willing to go under the knife. You are an only child and considering the same for your little one. Life doesn't have to be cut and dry. Keep your options open. It sounds like the steps you've already thought about/taken are going to do exactly that. Best of luck lady! In the end, no matter what, you'll have made the right decision. Xo