The cult cross-over carrier from Fidella:registered:. Our Fly Tai is a combination of a baby sling and comfort baby carrier. The wrap-like cross-over carrier adapts individually to every baby and caregiver. The Fidella:registered: Fly Tai is ergonomic and can be individually adapted to your growing child. Whether the baby or toddler version, determined by the size of your child. The sling carrier can be carried in three ergonomic positions.