We went on a Carnival cruise with an 8 year old and a 3 year old, and did not tip for the kids across the board. Reason being, most of the time they did not eat in the dining area with us, so no reason to tip the head waiter, chef, our waiter, etc. (in fact most of the time we didn't eat in the dining room either! Alas we still included them in our tips though.) Our steward got the adult portion of the tips, plus extra we handed him on disembark day, for all of the extras he did for us during our stay. Also tipped on disembark a special waiter that found us on deck and brought us (and bought a few!) drinks whenever we were out and about. We also hand-delivered tips to the kids club (where our kids didn't want to leave!) I don't recall how much it was for the kids, but we felt it was too much for the services rendered specifically for the children. However we did "take care of" the ones that did tend to them and make their trip equally as enjoyable! I wouldn't hesitate to do this again on our next cruise. Just my 2 cents for what it's worth!