My son was 3 as well. He had a few dummies, only for bedtime by that age. One by one they mysteriously got holes in, where the rubber bit joins the plastic. So, when a hole appeared, nope, that ones broken now, it'll have to go in the bin, the shop won't let us have any more now you're 3!
Last one finally got a hole in......he put it in the bin himself ' don't need that now Mummy'. We had 2 restless nights where he'd wake up & look for it, but then he was fine.
He's nearly 29 now, I might tell him the story of how the holes kept appearing one day
