Which of the following is a stage of infant cognitive development?

The sensorimotor period is a crucial stage of infant cognitive development, which typically occurs from birth to around two years of age. During this stage, infants learn about the world through their sensory experiences and motor actions. They actively explore their environment, using their senses to gather information and their movements to interact with objects. This exploration leads to significant cognitive growth as they develop skills like object permanence—the understanding that objects continue to exist even when they cannot be seen.

In contrast, the other options do not specifically describe recognized stages of cognitive development. The reflexive period pertains to the initial reflex actions exhibited by newborns, but it does not encompass the broader cognitive growth that occurs during the sensorimotor stage. The Moro period refers to a reflex in infants when they startle in response to sudden movements or noises but is not a developmental stage. The perinatal period relates to the time immediately before and after birth, which does not address cognitive development stages that unfold after birth.

Thus, the sensorimotor period stands out as the correct choice for a stage of infant cognitive development, since it embodies the active engagement and learning processes that infants undergo in their early years.