"Cookie, Pees"???

Lately, Sean has been eating quite a bit at each meal and we have rewarded him with an animal cracker at the end, which we call a "cookie". Well, lately, he has been downright asking for a cookie after every meal. He says quite a few words but none quite as clear as, "cookie?, pees" (please). It is hard to resist his cute face! Although, last night we had to. All he ate was a little plain rice and a banana. I fear he has inherited the "picky-ness" from me. He even turned his plate around like I do the other day. If he starts wiping his fork in between foods, we are in trouble!