Are you speaking about the bag for flies that all you do is add water?
You can try giving some Benedryl at a dosage of 1cc/1mg per pound of body weight every 8-12 hours. This should stop the allergic reation that your baby is experiencing. You can also give a bath with some regular blue Dawn Dish Soap to remove any residue on the body. Also try some toast to help absorb any of the liquid ingested. Joan Jav917