Related Experiment Videos
Infants with a thumb-in-fist posture
1Departments of Pediatrics, Bruce Rappaport Faculty of Medicine, Technion Institute of Technology, Haifa, Israel. mfjaffe@netvision.net.il
Pediatrics
|March 4, 2000
Summary
Thumb-in-fist (TIF) posture is common in newborns and usually resolves by 7 months. Later TIF resolution may indicate a delay in language development, warranting clinical attention.
Area of Science:
- Neonatal development
- Neurodevelopmental pediatrics
Background:
- Thumb-in-fist (TIF) posture, where the infant's thumb is enclosed within the palm, is frequently observed in early infancy.
- This common neonatal presentation has been under-investigated in the neurodevelopmental literature.
Purpose of the Study:
- To investigate the prevalence, typical resolution timeline, and clinical associations of the thumb-in-fist posture in newborns.
- To explore potential links between TIF resolution and neurodevelopmental outcomes.
Main Methods:
- A cohort of 200 healthy, full-term newborns was prospectively followed until TIF resolution.
- Neurological status and developmental assessments (including motor and language milestones) were conducted at 12 months for a subset of the cohort.
Main Results:
- Thumb-in-fist posture was observed in 62.5% of infants, with a mean resolution age of 1.5 months.
- All cases of TIF resolved by 7 months of age.
- No correlation was found between TIF resolution and abnormal neurological signs or motor development, but a later resolution was associated with delayed language attainment at 12 months.
Conclusions:
- Thumb-in-fist posture is a common, transient neonatal finding, typically resolving by 7 months.
- Persistent TIF beyond 7 months may signal underlying neurological dysfunction.
- A potential association between delayed TIF resolution and delayed language development warrants further investigation.