I was brought up oldest of 8 and I know from experience what having too many kids can do to ones health. While I would not give up my brothers for anything, it really weighted on our family and my mom's health.
I was brought up to believe to have as many children as you can TAKING UNDER CONSIDERATION your health, finances and mental abiltiy. You don't have to be rich, but able to put a decent meal on the table, not the healthiest, but healthy enough to get out of the bed and take proper care of them and mentally sound to handle the amount you can handle. For some that might be seven or eight kids, but for some maybe only one! We are all different. Those who chose not to have kids to me are making the wise decision for them at that time.
I was brought up LDS and never told to have alot of kids, no pressure to either. Also, education and a career was always supported. I have 3 kids and probaly all I will have, because it is what me and my husband can handle. We should never judge a person's decision when it comes to their decisions on whether to have children, how many, etc.