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[The relation between one-sided occipital flattening and laterality of rolling-over]
T Hayashi1, T Ichiyama, H Tanaka
1Department of Pediatrics, Yamauchi University School of Medicine, Ube.
Insights
Infant rolling-over laterality, a motor development milestone, is not linked to head positioning or skull flattening. This study found no significant relationship between these factors in 7-month-old infants.
Area of Science:
- Developmental Pediatrics
- Motor Development
- Infant Health
Context:
- Rolling over is a key infant motor milestone.
- Infants often develop a dominant side for rolling.
- Skull occipital flattening is commonly attributed to head positioning.
Purpose:
- To investigate the relationship between infant rolling-over laterality and skull occipital flattening.
- To determine if head positioning influences asymmetrical motor development in infants.
Summary:
- A study of 2919 seven-month-old infants examined rolling-over side and occipital flattening.
- Results showed no statistically significant positive relationship between rolling-over side and occipital flattening.
- The findings indicate that rolling-over laterality is not associated with head positioning in early infancy.
Impact:
- Challenges the assumption that head positioning directly causes rolling-over laterality.
- Provides evidence against a link between positional molding and asymmetrical motor development.
- Informs understanding of normal infant motor development and potential influences.
Abstract:
The rolling-over of the body is one of the developmental mile-stones. Several infants have the laterality of rolling-over in early state and the dominant side in later state. The abilateral occipital flattening is thought to be caused by head positioning in the neonatal period and early infancy. Asymmetrical development of rolling-over was studied in relation with head positioning, relating skull occipital flattening. We examined 2919 infants aged 7 months with the questionnaire about the side of skull occipital flattening and the initial turning side of rolling-over. 1975 infants had the dominant side of rolling-over; the left side 45.4%, and the right side 47.7%. 761 infants had one-sided occipital flattening; left-side 41.3%, and right-side 54.8%, 520 infants had dominant-sided rolling-over accompanied with one-sided occipital flattening. The positive relationship between the side of rolling-over and the side of occipital flattening could not be proved by chi-square statistical analysis. These findings suggest that laterality of rolling-over, one of asymmetrical motor developments is not related to the head positioning in early infancy.