T.W.
Hi A.,
I am in the healthcare field and own a Littman stethoscope which is the best one around. The one I have is a Classic II which is for infants on up to geriatrics, but it is a bit bulky. Some of the nurses have the lite one which is not only light weight but pretty. Go to www.allheart.com and search for Littman stethoscopes. Hope this helps.
I too have asthmatic children and know what you are going through, it is definitely not fun but it does get easier as they get older.
Hugs,
T.