Well, I don't know about babies, but know that I got black spots on my tongue once. My body was seriously out of whack, I was told it was yeast I believe- however I think that presents as white spots in babies? Anyway, mine was from constant yeast infections, vaginosis, etc. etc. from bc, and the medicine I was on to clear them up. I think I was given some type of fungal med myself and they didn't come back.
Happily Married to my : 11 yrs- Mama to wild-eyed monkey boy 7-04, fiery little girl 4-07, and the happy smiley baby that sleeps 11-09!