Welcome to HCM forum .
Your child is most probably having a viral respiratory infection
in which antibiotics are not much useful . Since steam inhalations provide relief , nebulisation with bronchodilator
medicines might help in faster recovery.
So please consult your doctor for re assessment & appropriate nebuliser medications And cough syrups containing ambroxol
Apart from this you can give plain steam inhalations thrice daily to relieve the chest congestion.
Wishing your child good health.