my ds has developed what seems to be a wheezy cough in the last 24 hours. he has just started school and is 4 . Whilst the cough doesn't particularly seem to be bothering him and is quite infrequent he is making a whistling/wheezy sound when he breathes. Consequently it appears that he is breathing quite rapidly but i don't know if this is just because i can hear him. Noty sure whather i should be acting on this, how can i tell of hsi breathing is in a normal range?