The baby’s black tongue can be handled as follows: 1. If you’re taking medication that causes the tongue to be black, such as iron or Chinese medicine, you don’t need to deal with it, it will disappear slowly after you stop taking the medication. 4. If your baby’s tongue is black because of the long-term application of antibiotics that lead to dysbiosis, you should stop using antibiotics and give your baby oral lactobacillus tablets to regulate the flora.