Tortle Air Lucky Elephant - Size Large (L) Used with signs of wear and tear (see photos). My child wore this only a handful of times. More pictures available upon request. For 4-6 months old, The LARGE Tortle Air Lucky Elephant promotes your child’s healthy development with the most advanced positioning aid. By actively deflecting your baby’s head to different areas while they’re lying down, the Lucky Elephant gently reshapes your baby’s head and fights Flat Head Syndrome.