R.S.
My son was given the spacer to use at age 3 also and it just didn't work. Some kids aren't cooperative and/or able to follow those kind of directions. I told the doctor and she replaced it with another device. I can't for the life of me think of what it is called but it is a cylinder shape, about 6 inches long, made of a thick, flexible plastic. All they have to do is breath in while you gently push the air out of the bag like thing. I am sure someone else will be able to come up with the name and if I do, I will repost. Anyways, it worked MUCH better and I was able to be sure he was getting the medicine in. It helped lots. Talk to your dr. there are always other ways when something isn't working. That is what you pay them for!! Best of luck. By the way, by son is now 4.5 and has outgrown it.