Personalized 4th Birthday Mermaid Tail Girls Long Sleeve Creeper. 4th birthday Long Sleeve Creeper - Natural party idea has starfish and mermaid tail with this mermaid is 4 message For chillier weather, dress baby in this soft long sleeve creeper in a great fitting 1x1 baby rib. 5.0 oz., 100% combed ringspun cotton, 1x1 baby rib. White is sewn with 100% cotton thread, Flatlock seams, Double-needle stitched rib binding on neck, shoulders, sleeves and leg openings,Reinforced three-snap closure on binding.