You don't technically get 3 sit down meals a day. You receive 3 meal credits for each person for each night of your stay, which can be used for either table or counter service. You receive credits for everyone over the age of 3; children 3-9 will get child credits and anyone age 10 and above will get adult credits. You can use these credits in any combination you want over the course of your stay. Some restaurants count as two credits per person; if you book any of these you may not have enough credits to schedule three table service meals for each full day of your trip and charge them to the dining plan, so if you want three table service meals a day, make sure you know which meals will cost you two credits per person before you book reservations. It's entirely up to you how to allocate the meal credits you receive.