What essential oil is good for congested nose and coughs for a 6 month old baby? If diffusing is the safest method , can it be done with baby in the room?

If it is tested and proven that baby is okay with essential oils. I would use something organic. I have seen the organic essential multi purpose oil which can also be used for cuts and bruises. I would say Eucalyptus is good for helping LO with the flu and congested nose. Keep a look out of the brands and tyoes before deciding.