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By this age, infants may have doubled their birth weights. They typically grow about 0.8 inches (2.0 cm) and gain about 1 to 1.5 pounds (450 to 680 g) during this month. [28] Fat rolls ("Baby Fat") begin to appear on thighs, upper arms and neck. Motor development. May be able to roll from front to back. [29] Starts to reach and grasp for ...
However, babies as young as seven minutes old prefer to look at faces. The three primary achievements of this stage are sucking, visual tracking, and hand closure. [8] 1–4 months: Primary circular reactions – Babies notice objects and start following their movements. They continue to look where an object was, but for only a few moments.
When examining an infants preferred visual stimuli, it was found that one-month-old infants often gazed mostly at prominent, sharp features of an object – whether it is a strong defined curve or an edge. [8] Beginning at two months old, infants begin to direct their saccades to the interior of the object, but still focusing on strong features.
[4] Peekaboo is thought by developmental psychologists to demonstrate an infant's inability to understand object permanence. [5] Object permanence is an important stage of cognitive development for infants. In early sensorimotor stages, the infant is completely unable to comprehend object permanence.
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A list of reflexes in humans. Abdominal reflex; Accommodation reflex — coordinated changes in the vergence, lens shape and pupil size when looking at a distant object after a near object. Acoustic reflex or attenuation reflex — contraction of the stapedius and tensor tympani muscles in the middle ear in response to high sound intensities.