U may want to use Garlic Balm..apply over at your baby chest, soles and spine. Or u can get Breathe Easy from Mommadee, Inara Organics, etc.. or best go to Paed, they will advise you on medication n the ml u can give.
Bring baby to yu Guo tcm. A lot of babies go there. There are babies as young as 1 month old. But be prepare to Q. No medication. It works for my girl. 1 session and she stop coughing.