Products that contain bismuth can temporarily turn your tongue black, according to Atlas of Adult Physical Diagnosis. Other Causes If you have a black tongue, then you could have a fungus called Aspergillus niger growing on the surface of your tongue. If you have too much bacteria growing in your mouth, it could cause your tongue to appear black and hairy, according to the Mayo Clinic.
In addition, a child is said to have a cognitive delay and/or a learning disability when they are performing at least two grade levels below their peers. For example, a third grade class is learning their multiplication tables, but a student with a cognitive delay would be performing math on a first grade level.
Developmental Delay is most often a diagnosis made by a doctor based on strict guidelines. Usually, though, the parent is the first to notice that their child is not progressing at the same rate as other children the same age. If you think your child may be âslow,â or âseems behind,â talk with your child's doctor about it. In some cases, your pediatrician might pick up a delay during an office visit.