I asked him about it when I first heard about it. He said we could go ahead and give it a try. I asked him was their any possible way it could hurt her or do any damage, he said no, but she may not tolerate it to well. I asked if we could try it, he said let's give it a shot. He didn't seem worried about her air passages being to small and I really think if it was going to hurt her he wouldn't have let us try it. our doc is pretty aggressive and proactive. We go back on Thurs. and we will discuss how she is doing with everything including HTS. She only does a small amount once a day but it is the 7%. She tolerates it well but we always do it when she's still sleeping or very sleepy. He didn't really mention if their was an appropriate age, but she was about 8 months. Granted if I didn't ask him about it, he probably would have waited to put her on it<img src="i/expressions/face-icon-small-smile.gif" border="0"> I hope this isn't to confusing.