My son started taking pulmozyme for the same reasons at the age of three. The treatment itself does not take long, so I would sit him on my lap and hold the mask for him while we watched one of his favorite videos. I think I did that for a few months and eventually he became comfortable to do the treatment himself. I wanted to reassure him and let him know that it was okay. Afterall, the treatment can be a little overwhelming - it is loud and steam comes out of your mouth - I know it was a little unsettling for me and was proabaly terribly frightening for him at the time. I felt that sitting with him for a few minutes everyday for awhile was a good investment towards making him feel comfortable about something that he will have to do the rest of his life. My only other advice would be to make it as fun and comfortable as possible. Figure out what your child likes best and try to work that into the time it takes for the treatment. Good luck.Katrina, mother to Sean (6 w/cf), Carolyn (4 1/2 w/o cf) and Allison 2 1/2 w/o cf)