Black hairy tongue: There are a number of ailments that can lead to black pigmentation on the tongue. Your baby probably has a "black hairy" tongue caused by too much bacteria or yeast growth in the mouth. The bacteria build up on tiny rounded projections called papillae. If you are breast feeding, this is very common. Initially the tongue is white with yeast alone, but when bacteria adds up, the color darkens.
Answered 7/24/2019
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