Some babies/children may have allergic reactions to aromatherapy
oils (or other scents). I found this out the hard way when my
daughter broke out in an agonizing case of hives which lasted
two days, after I added some aromatherapy oil to the inhalant
cup of her vaporizer. There are now essential oil products (eucalyptus,
etc.) which are being promoted especially for use in baby's vaporizers.