I used this from about 2 months old to about 5 months old, as I heard the C-curve is important. I used it inside the baby bed, and I put a large bath towel on top of it when using it. By using this, my baby slept soundly, and I was able to let them sleep in a good posture ☻ ★Product Name iimin C-curve baby futon ★Material Inner material: Wadding (100% polyester) Side fabric: Breathable mesh (100% polyester) ★Size Approximately width 45 x length 74cm Height (highest part): Around 15cm at the top of the head, around 12cm at the foot ★Weight Approximately 1000g The volume and finish of the product are handmade by craftsmen to be uniform. Due to changes in the specific gravity of the cotton depending on the cotton production lot and climate, there may be some individual differences in weight. ★Color White ★Target age There are individual differences in the growth of children, but the usage period is a guide up to around 1 year old. The recommended usage period is until the baby starts to roll over (around 4 months old). If you use it after the baby starts to roll over, please be careful not to fall out of the bed, and do not take your eyes off your child. ★Care instructions ・Since it takes time for the material to dry, please wash it partially by hand when washing. ・Using a washing machine may cause the inner wadding to become uneven, so please wash it by hand. ・Avoid tumble drying and dry it in the shade in a well-ventilated place after shaping it. ・Please use it after it is completely dry. ★Made in Japan For those who understand that this is a used item and has been stored at home, thank you very much m(_ _)m