[Plagiocephaly associated with infant asymmetry]

Area of Science:

• Pediatric neurology
• Developmental pediatrics
• Neonatology

Context:

• Infant asymmetry is commonly observed 2-4 weeks post-birth.
• It often develops secondary to plagiocephaly, characterized by unilateral occipital flattening.
• This flattening can lead to persistent head rotation and associated musculoskeletal changes.

Purpose:

• To describe the typical progression and clinical manifestations of infant asymmetry.
• To highlight the link between plagiocephaly and the asymmetric tonic neck reflex (ATNR).
• To outline current management strategies for infant postural and muscle tone imbalances.

Summary:

• Unilateral occipital flattening in infants causes head rotation, neck muscle shortening, and triggers the ATNR (fencer response).
• This results in increased facial muscle tone and decreased occipital tone, potentially leading to neck stiffness, scoliosis, and pelvic obliquity.
• Management involves early positioning, supervised 'tummy time,' and physical therapy.

Impact:

• Provides a clear understanding of the pathophysiology of infant asymmetry.
• Emphasizes the importance of early detection and intervention for plagiocephaly-related issues.
• Informs healthcare providers on conservative management approaches to address infant postural asymmetry and muscle tone imbalances.