we used to tell my younger brother that if you ate watermelon seeds then a watermelon would grow in your stomach so he figured to grow a baby in your stomach you had to eat baby seeds.
A childhood belief about reproduction

others believed things like this
- If you eat watermelon seeds a watermelon will grow in your tummy and vines will come out your earsAnon
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon
- I used to believe that if you ate a watermelon seed you would grow a watermelon tree in your stomach!!!— Eskimo
- I used to believe that if you swallowed watermelon seeds, they would dance around in your stomach at night.— jaalyn
- I used to think that if i ate watermelon seeds they would grow out of my ears.— Catherine
- I used to beleive that if you ate a black watermelon seed a tree would grow in your stomach— anonymous