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Signs of Weakness: 6+ months PDF Print E-mail
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Wednesday, 22 June 2011 17:25

Milestone: Sitting


Evaluate sitting without support at 6-month visit and getting into sitting position at 9-month visit, or until achieved.

Surveillance & Next Steps

A child is not sitting independently by 7 months or getting into a sitting position at 9 months: CK and referral

What does weakness in achieving and maintaining sitting look like?

Developmental norms

Sitting without support**: 50% by 5.9 months, 75% by 6.7 months, 90% by 7.5 months

Getting into sitting*: 50% by 8.5 months, 75% by 9.5 months, 90% by 10 months

*Source: Denver II

**Source: WHO Multicentre Growth Reference Study Group: WHO Motor Development Study

Download a pdf of the Surveillance and Referral Aid for Primary Care Providers. This Aid includes assessing weakness by age, clinical evaluation for muscle weakness, guidance on the use of CK testing, and the motor delay algorithm. These materials have been endorsed by the American Academy of Pediatrics.
Last Updated on Thursday, 30 August 2012 15:33