Judgmental inlaws and family... help?

How do you deal with judgemental family/in laws that like to make comments on how many kids you have?

We have 2 little girls. A nearly 3yo. And a 9mo (will be 1year December 22nd) and hubby and i want to start talking about having a 3rd. We are terrified of our family's reactions... They were so negative with the 2nd. Yes, we are young (im 21 my husband is 23). We make 70k+ a year, have 2 new cars, in the process of buying a house, have little to no unneeded bills, and amazing insurance.... i dont see the issue of having a 3rd...