Has any parent used 保婴丹 (bo Ying Dan) for LO cough?

Agree with Diana. I would advise against self medicating. How about trying out some home remedies for cough? If you intend to try this out, do take your baby to a qualified TCM practitioner so he can assess your child's condition and prescribe a formulated prescription accordingly. http://sg.theasianparent.com/your-kids-cough-what-you-need-to-know/