My Moms house always get them in the Spring/Summer in the bathrooms where its kind of damp. They make something called Damp Rid. I found it a BB&B. Its a granule you put in the cup it comes with and it sucks the moisture out of the air. They say to put it under the toilet/back of cabinet or in the corner but you could put on top of the toilet/counter so your child doesn't get to it.