Child ate a plum seed?

My 15 year old daughter swallowed a plum seed a few minutes ago by cracking open the case and swallowing what was inside (don't ask me why she did this, she's a odd , xD) and I was wondering it this would be harmful ?

Child ate a plum seed?
It probably didn't taste that good, but I doubt it's going to do her any harm. It'll just pass through her digestive system like any other food. When I was a kid, I used to eat apple seeds all the time. And even swallowed a few cherry pits. I heard that plants would grow inside the stomach if you ate seeds, but that's an old wives' tale:)
Reply:no, plants only grow when there is soil, water and sun, in your stomach there is ONLY water so it can't be harmful. when i was 6 i swallowed a plum seed and nothing happened to me over these 6 years
Reply:If your child has a normal bowel, the "seed" should pass.
Reply:IT SHOULD COME OUT IN A FEW DAYS!! IF NOT CALL A DR. !!