At four months old, babies can already tell red from yellow, but bold black-and-white patterns still stand out because their developing visual system needs far more contrast than an adult’s

{"content":" At four months old, a baby lying on their back in a crib is looking at a world that has almost no red in it. The long-wavelength cones on the retina — the ones that let adults tell a fi The post At four months old, babies can already tell red fro…