My DS who will be 4 this month, has started wetting the bed. He started doing it last wednesday and has done it every night since then. The only possible change that i can think of that may have cause this, is the arrival of his baby sister last weekend, she is still in the hospital in an incubator, because she arrived at 27 weeks and and he still hasn't seen her, he will visit her for the first time tomorrow. Do you think this might be the reason for the bedwetting or do you think something else is causing it.