In newborns, the sense that is LEAST developed, and least similar to adult senses, is

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Vision is the sense that is least developed in newborns. At birth, babies only see in black and white, and their eyesight is blurry. Over time, their vision improves as they develop the ability to see colors and focus on objects at different distances. In contrast, newborns have a well-developed sense of smell and taste, which helps them to identify their mother's breast milk and other familiar scents. They also have sensitive hearing, although their ability to distinguish different sounds is not as mature as in adults.

In Newborns, the Sense That Is LEAST Developed, and Least