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Neurodevelopmental assessment in the first year with emphasis on evolution of tone
1Department of Pediatrics, King Edward Memorial Hospital, Pune 411 011, India. kemhrc@vsnl.com
Insights
This study tracked 100 infants for one year, establishing developmental milestones for passive and active tone. Findings provide a reference for neurodevelopmental assessment and early intervention in infants.
Area of Science:
- Pediatrics
- Neurodevelopmental Pediatrics
- Infant Development
Background:
- Early neurodevelopmental assessment is crucial for identifying brain damage.
- Assessing passive tone is vital for planning effective interventional therapies.
Purpose of the Study:
- To prospectively evaluate neurodevelopmental milestones in infants during the first year of life.
- To establish normative data for passive and active tone assessments.
Main Methods:
- Followed 100 infants with normal birth histories for one year.
- Monitored developmental milestones (social smile, object transfer, clapping, scribbling).
- Assessed neonatal reflexes, passive tone (popliteal, adductor angles, scarf sign), and active tone (head support, pull to sit/stand).
Main Results:
- Established age-specific milestones for social smile, object transfer, clapping, and scribbling.
- Documented the disappearance of neonatal reflexes and appearance of protective reflexes (lateral propping, parachute).
- Quantified changes in passive tone (popliteal, adductor angles) and active tone development over the first year.
Conclusions:
- The study provides normative data for key neurodevelopmental milestones and tone assessments in the first year.
- These findings can aid clinicians in identifying deviations from normal development and guiding early interventions.
Abstract:
Neurodevelopmental assessment in the first year of life is important for determining presence or absence of brain damage. Assessment of passive tone is essential for planning interventional therapy. One hundred infants with a normal antenatal, natal and perinatal course were prospectively followed up for one year. Social smile had appeared by 6 weeks in all infants, transfer of objects at 6 months, clapping by 9 months and scribbling on paper (imitative or spontaneous) by 12 months. Neonatal reflexes disappeared by 3 months, lateral propping appeared in all infants at 9 months, however parachute reflex appeared in 96.5% of 87 infants tested at 9 months. Measurement of passive tone by popliteal angle and adductor angle was done at 3, 6, 9, 12 months and scarf sign was also evaluated. The mean popliteal angle increased from 100.6 +/- 5.4 at 3 months to 136 +/- 4.0 at 12 months, whereas the adductor angle increased from 84.8 +/-6.5 to 126.6 +/- 5.3 degrees. The fast and the quick component of the dorsiflexion angle showed a difference of less than 10 at all testings. Assessment of active tone in the form of head support at 3 months was present in all the infants, 95% had pull to sit at 6 months and all 100% had pull to stand at 9 months.
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