My son (2 next month) has been settling in at nursery these past 2 weeks and hasn't eaten a great deal because he has been a little nervous...Was getting him ready just now and was hit by overwhelming smell of fish from his (wet) nappy! Everything looks ok, no rash. Do you think it could be to do with not eating much? Has anyone ever experienced this? I think it is his urine that smells, as opposed to him passing wind.