A cleft skull is a pathological condition in which the bones of the skull are separated along their midline. The separation may be incomplete or complete. Complete skull separation is relatively rare (5-15 per million births) and almost always results in intrauterine fetal death. A cleft skull can occur as an independent disease or secondary (as a complication) in some other diseases (congenital deformities of the limb, spinal deformities, congenital craniosynostosis, etc.) The absence of clefting between the bones of the anterior part of the skull (frontal, temporal and nasal) is not considered a cleft skull. In premature newborns, the absence of the frontal and sphenoid divergence of the skull bones is usually easily visualized. In children of the first year of life, visual identification of cleft sutures is almost always possible. However, the difficulty of identifying this pathology is associated with the individual characteristics of the brain tissue, which often forms only after birth. Incomplete cleavage can lead to disruption of many body functions, including the skeletal system. The limbs of an underdeveloped baby are too long due to the presence of elements of the previous skeleton; the presence of remaining elements gives an incorrect posture; children with this diagnosis develop poorly and suffer from serious illnesses. Adults who are diagnosed with a cleft skull are not recommended to engage in sports or physical activity without a doctor's permission. Regular exercise can lead to injuries and strains of bones and muscle tissue, poor circulation and chronic inflammation. In general, the prognosis for such diseases is very unfavorable, but surgical treatment can be considered, which requires constant care and supervision from doctors.