It seems they reach healthy adult sharpness by 6 months [1]. By the time they are sitting and starting to move they are certainly extremely good at finding tin

It seems they reach healthy adult sharpness by 6 months [1]. By the time they are sitting and starting to move they are certainly extremely good at finding tiny bits of fluff etc. to put in their mouths! [1] https://en.wikipedia.org/wiki/Infant_visual_development https://en.wikipedia.org/wiki/Infant_visual_development