So what if Abby drinks her Pediasure out of plastic shot glasses I found at the Walmart check-out aisle?!
She loves the bright colors and likes dictating which color she wants to drink from next. The size is perfect for her because we've found that bigger cups with the same amount of milk in them overwhelm her. I pour four "shots" at each meal and if she finishes all of it, it's about 3 ounces. That's really good for Abby!! Our feeding therapist LOVED the cups and thought they were perfect. She's going to start suggesting them to other families!
So...I say, whatever works!!
For the record, we have not yet actually done this out in public. I fear what I might say to a "well-meaning" stranger who chastises us for encouraging under-aged drinking...