leaves getting yellowish sections also when should replant?(pics)

plants are just less than a week old, the first one sprouted last friday, havent checked the ph level and the pots are about 3.5 inches wide and just under 4 inches tall the tallest seedling is 4 inches tall and the shortest one is about 2". when should they be replanted to bigger pots? also some of the leaves started to get lighter green-yellowish spots. whats wrong with them?

one of two things.. the yellow spots can either mean a nitrogen deficiency.. or 2: can mean that your nutrient burning your plants?? been giving em fertilizer??? anyways fix that first.. you want to replant when the sprout has a reeal nice tap root (the big one that forms straight down) and a decent root structure beside it.. don't expose the roots to much light when you check e.. keep it brief.. good luck.. let me know if you got any other ?'s.. later

thanks for the input as for fertilizer and nutes i havent done any of that yet and i havent checked the ph of the soil. i was reading a bit more about this same problem and the most common issue seems to be that the plants are too close to the lights? my plants were probly like 1cm away from them so im guessing that could the problem