I used to belive that when you got married the bride and groom told the pastor how many kids they wanted and he would give them a seed (like a plant seed)for each kid.
A childhood belief about marriage

others believed things like this
- if you eat a seed, the plant will grow in your tummyAnon
- Once my brother said me, the poppy seed in fact is ant. I have not eaten poppy seed for many years.
Anon - I thought birds grew from bird seed. — Jen
- If you swallowed a watermelon seed it would grow in your belly— Rachelle
- I used to believe that a tree would grow inside you if you ate the seed of an apple or any other fruit!Anon
- I used to believe that the mole in my belly button was a poppy seed from a muffin I ate.Anon