2. Small Head

When the brain of a baby doesn't grow properly, the head doesn't increase in size. Doctors generally take head measurements until children are 2 or 3 years old. If the child's head size is lower than a certain average, then they're considered microcephalic. Many causes exist for microcephaly or small heads in babies. Protein contains the mutated gene involved with Rett syndrome, which is necessary for the development of the brain and nervous system. Small brain growth also affects the slow development of the body of a child suffering from Rett syndrome.

Rett Syndrome babies

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