with flooding in the area it may b caused by mold which can b seriouse make sure u and the kids get fresh air and get to the dr as soon as u can if its not safe to get to a dr or hospital u should call the dr and get advise over the phone
yes, nebulizers can be used on babies, my nephew has used one since he was about 6 months old, only when he gets sick. when he is sick he has a hard time breathing and nebulizers work wonders for opening up the airway. it is perfectly safe to use one on a 9 month old. if you are still concerned you can call your pediatrician or even the on-call doctor. good luck to you! also have you taken the baby to a doctor recently? severe coughing fits could be a sign of a more serious illness or infection. not to freak you out but its always safer to get to get the child to a doctor as soon as you can.
source: have worked in daycare for 3 years, now a nanny to 4 kiddos including a 4 month old baby
I have just googled and it appears that the answer is yes it can be used, however I suggest that you google and take a look at what they say , we do have a doctor/expert forum on MH and I think you should put this question up there for a more qualified opinion, good Luck