For GMA scoring, infants will be placed in supine position wearing only a diaper to allow for clear observation of trunk and limbs spontaneous movements. Infants will be observed and videotaped for 5-10 minutes in an awake but calm state without interacting with people around them or while playing with a toy. The classifications of "typical" and "atypical" of different movement categories of GMA will be determined to define the ranks of motor outcomes in each infant.