Comfort for babies with thrush: natural remedies
I haven't tried all of these but others have:
Clove essential oil internally. Diluted clove oil (1 drop to 15 drops of v-6 carrier oil)
Thieves (it acts as an antibacterial)
"I made a blend of Thieves, melaleuca, and lavender and sprayed it in her mouth a few times a day. It was almost gone 24 hours later."