👉 Microstomia is a medical condition in which an infant's head, neck, and spine are smaller than normal. This condition can cause problems with breathing, eating, and growth, as well as difficulty with posture and balance. Microstomia is typically caused by a genetic disorder called microcephaly or microhypoplasia. In this case, the baby's brain and other important organs are smaller than expected, leading to difficulties in development and growth. Microstomia can affect