Of course it has shrunk for Mormons. Look at how the number of missionaries fell. Most of that was due to demographics.
1. desire for career and money
2. want to have GAP kids and fancy playdates and private schools
3. perception that one cannot adequately provide emotional and financial support for more than 2 kids
4. just never get around to it. "bad timing"
5. "boutique family"
6. start too late
7. dogs and cats are just as fulfilling
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