Johnny is 4 months old and his older brother gus is playing with him. gus holds up a bright red ball for johnny to look at, but after a couple of minutes johnny stops looking and looks away when his b

Johnny is 4 months old and his older brother gus is playing with him. gus holds up a bright red ball for johnny to look at, but after a couple of minutes johnny stops looking and looks away when his brother attempts to capture his attention again with the ball. johnny has