The Child Focused Injury Risk Screening Tool (ChildFIRST) aims to measure movement competence and lower-limb-injury risk in 8-12-year-old children. Although the ChildFIRST has face and content validity evidence, stronger validity evidence is warranted. We tested the concurrent validity of the ChildFIRST using motion analysis, and the convergent validity of the ChildFIRST using the modified Star Excursion Balance Test (mSEBT) and the Test of Gross Motor Development 3 (TGMD-3). We computed correlation coefficients (0.05 alpha level). We evaluated 17 participants. We observed positive correlation values between 18 ChildFIRST evaluation criteria and peak joint angles in the frontal and sagittal planes. One movement skill (i.e. leaping) presented a negative correlation value. We observed positive correlation values between the ChildFIRST and TGMD-3 and between the ChildFIRST and the mSEBT. Nine out of ten movement skills in the ChildFIRST are valid to assess movement competence and identify risk factors associated with lower-limb musculoskeletal injuries.