Transition Bag Bamboo Lite (for summer) L size = weight 8.5-11kg Made of bamboo material for a smooth, cool touch. Breathable, thin material. Stage 2: When the baby starts to roll over, or is about to. After rolling over, the sleeves can be removed. Thanks to the Swaddle Up, my newborn slept really well. I'm selling it because my baby has outgrown it. ・Please purchase only if you understand that this is a used item. Please refrain from purchasing if you are sensitive to such things.