So my son started using "the vest" a little over a week ago. He is not a fan by the way. My insurance companies approval dept and medical director denied the claim stating that it is unsafe for a child of his age and had not been proven to really make a difference. It is only recommend for children 7 and over. They state I can appeal this but it is up to his pulmonologist to weigh benefits an risks. Anyone else dealt with this before with a little one? He seems to be doing better lately and has less coughing.