What oil or somthing like vicks can you recommend if your child have cough? My dau is g6pd so she cannot use menthol..thanks!

I disagree, Eucalyptus is almost chemically identical to Menthol and has the same oxigenase pathway which uses the G6P where deficient babies cannot process that may lead to hemolysis. It is much better to use a humidifier (check humidifier vs diffuser), and saline nasal drops/spray to help ease congestion.