Quick service, this is fine. Table service, you will be more or less best off spending your 2 adult and 1 child points all at once, tho you certainly don't have to. The only place you'll have to spend all 3 at once is at character meals or fixed price buffets.
Except OP doesn't have a child credit; her child is a Disney adult, so they can save that adult credit and eat at more TS restaurants.