What medicine is safe for coughing, sneezing and flue of g6pd deficiency baby of 5 months? please guide me?

You should not use medication at this age for those symptoms which are usually self limited. If symptoms get worse and your baby still has high fever after 3 days, baby should be examined by a pediatrician. For fever in the first three days you can use acetaminophen drop or suppository or you just apply cold compress on head and trunk as needed.