Uji kesahihan interna dan keandalan Ages and Stages Questionnaires Third Edition (ASQ3) bahasa Indonesia sebagai alat uji penapisan keterlambatan perkembangan anak usia 1 sampai 12 bulan = internal validity and reliability of Ages and Stages Questionnaires Third Edition (ASQ3) Indonesian version as a screening tool for identification developmental delayed in 1 sampai 12 months old children.