SUMMARY: This document reopens the comment period on a supplemental notice of proposed rulemaking (SNPRM) to amend Federal Motor Vehicle Safety Standard (FMVSS) No. 213@ ????Child Restraint Systems.'' Among other things@ the SNPRM proposed to specify procedures the agency would use to position a Hybrid III 10-year-old child dummy and a Hybrid III 6-year-old child dummy in booster seats when conducting FMVSS No. 213 compliance tests. Comments on the SNPRM were due March 24@ 2008. The Juvenile Products Manufacturers Association (JPMA) petitioned NHTSA to extend the comment period by a minimum of 60 days to appropriately respond with comments to the notice. We have granted the request to extend the comment period and are reopening the comment period for 45 days.