Feeding pinkies is not necessary. They get all of their food requirements from invertebrate prey (except for certain minerals which are provided by dusting the insects). The only time I ever fed pinkies was when I brought my females off of their cooling period. The pinkies helped pack on the weight in preparation for breeding. I gave them one pink a month for three to four months in the spring. An adult leo will not choke on a small pinky.