The purpose of the study is to examine how cranial helmet therapy may affect neck movement and body temperature regulation in children with positional head deformity. The study will also look at factors that might influence how well the therapy works, such as the child's age, sex, and the type of head shape deformity.

During the study, children will undergo several assessments:

measurement of head shape using standard cranial indices, recording of body surface temperature with a thermal imaging camera, evaluation of neck mobility, focusing on rotation of the cervical spine.

Inclusion Criteria:

• positional head deformity of severe or very severe degree;
• age at therapy initiation: 4-12 months;
• minimum therapy duration of 12 weeks (for Stage 1 and Stage 2).

Exclusion Criteria:

• craniosynostosis;
• hydrocephalus;
• non-adherence to 23-hour daily helmet use;
• metabolic disorders;
• torticollis.

Participants are children from various cities in Poland, aged 4-12 months, diagnosed with severe or very severe positional head deformity and referred for cranial helmet therapy by a neurosurgeon. Both boys and girls are included. All referring physicians used the same standardized scale to determine the severity of the deformity, ensuring consistency across sites.