קטן\קטנה (katan\ktana) means small (size, sometimes age) "a little" would translate to קצת (Ktzat) or מעט (Me'at). These two words are mostly interchangable with few exceptions: "slightly" would call for קצת. "few" or "some" (countable) translate to מעט.

"כן, קטן / קצת בבקשה" "ken, katan / ketzat be'vakasha" (katan-m, ketana-f) do u want milk? - ken, ketzat be'vakasha. do u want cookie?- ken, ketana be'vakasha.