Cognitive development refers to how a person perceives, thinks, and gains understanding of their world. Areas of cognitive development include information processing, intelligence, reasoning, language development, and memory. Infants are born with the ability to learn through sight, taste, hearing and touch and will explore their world through these new abilities. This constitutes the main basis of cognitive development. If the infant is unable to learn with these senses, learning may be delayed. Sometimes delays can be caused by physical abnormalities such as blindness, deafness, mutism, or even being born without limbs. Children learn in different ways and do not need to rely on these senses per se, but because these senses play a very important role in the development of cognitive abilities, there may be small delays or even delays very important, which can cause problems throughout life. scope. There are stages to watch for during cognitive development. Generally, around four months, the child should be able to explore objects with his fingers, hands and toes, recognize the bottle or breast, turn his head towards bright colors and lights, smile responsive manner, and should be able to recognize parents. Around eight months, the child should be able to discover hidden toys.,