40. Bayley Scales of Infant Development Age Mental Items Motor Items 1 month Infant quiets when lifted. Infant makes postural adjustment when lifted. 2 months Infant glances between two objects over crib. Infant hold head steady when carried. 5 months Infant transfers object between hands. Infants attempts to pick up object out of reach. 8 months Development of object permanence. Infant raises him/herself into sitting position. 12 months Infant imitates words that are spoken. When requested, infants stands up. 14 – 16 months Infant builds tower with two blocks. Infant walks alone with good coordination.