 This study has shown that there is a relative age effect, i.e., on fundamental movement skills, FMSs, in Chinese preschool children. Girls showed higher scores than boys in the lower quarter of birth category, while boys had higher scores than girls in the upper quarter of birth category. Additionally, younger children had higher scores than older children in both genders. These results suggest that teachers should be aware of the effect of IE on FMS when approaching development, evaluation and teaching approaches in preschools.