Q. Do Mormons believe in the use of birth control or only mass producing children?
A. Only mass producing children. That’s why so many Mormons are going into engineering. . . there has got to be a more efficient way.
Ha. There are a LOT of shades of grey between those two options. This post by Megan addresses some of those issues. For the record though, there are Mormons with no children and Mormons with 15+ children. For everyone, it is a personal decision between the husband, wife and the Lord; not a mandate from the Church.