Convatec Little Ones® Standard Flexible Wafer with Tape Collar 4" L x 4" W Size Square Shape 1-3/4" Flange, Two-piece Barrier ConvaTec Little Ones® ostomy system, finding the right ostomy system is elementary. Each product has been specially designed to comfortably fit a child's unique body contours. All Little Ones® products are flexible, durable and easy to remove.