Psychologist renée baillargeon found that three-and-a-half-month-old infants appeared surprised when they watched a carrot pass behind a screen but fail to appear in a window in the screen. according to baillargeon, this suggests that infants understand at a much earlier age than piaget suggested.

according to Baillargeon, this suggests that infants understand "object permanence" at a much earlier age than Piaget suggested.

Object permanence is the understanding that articles keep on existing notwithstanding when they can't be (seen, heard, touched, noticed or detected in any capacity). As indicated by this view, it is through touching and dealing with objects that babies create object permanence. 

The adams apple, or laryngeal prominence. is a feature of the human neck, and is the lump or protrusion that is formed by the angle of the thyroid cartilage surrounding the larynx seen especially in males.