{"product_id":"newborn-performance-swaddle-suit-m","title":"Performance Swaddle Suit M | Performance Tension","description":"\u003ch2\u003eStage 2 swaddle for babies who are starting to move more\u003c\/h2\u003e\n\n\u003cp\u003e The Performance Swaddle Suit M is designed for approximately 1–3 months, when babies begin reaching, stretching, and moving their arms and body with noticeably greater strength. \u003c\/p\u003e\n\n\u003cp\u003e It is not simply a larger version of the S size. The fabric, tension, and arm construction are engineered differently to respond to the increased movement, heat, and sleep behavior of a growing baby. \u003c\/p\u003e\n\n\u003ch2\u003ePerformance fabric with enhanced breathability and dry comfort\u003c\/h2\u003e\n\n\u003cp\u003e As babies become more active, movement during sleep can also increase heat and moisture around the body. \u003c\/p\u003e\n\n\u003cp\u003e The M size uses a high-performance yarn engineered for improved airflow, moisture absorption, and quicker drying, helping create a drier and more comfortable sleep environment for this more active developmental stage. \u003c\/p\u003e\n\n\u003ch2\u003eCotton-like softness inside, cross-mesh ventilation outside\u003c\/h2\u003e\n\n\u003cp\u003e The inner surface is designed with a smooth, cotton-like feel where it meets the baby, while the outer surface features a distinctive cross-shaped mesh structure developed to enhance airflow. \u003c\/p\u003e\n\n\u003cp\u003e This dual-surface construction balances softness against the skin with enhanced ventilation and moisture release on the outside. \u003c\/p\u003e\n\n\u003ch2\u003eResponsive tension designed for growing movement\u003c\/h2\u003e\n\n\u003cp\u003e From around one month onward, babies often begin extending their arms, twisting their bodies, and moving with noticeably more force. \u003c\/p\u003e\n\n\u003cp\u003e Performance Tension fabric stretches in response to that movement and then returns to a supportive fit. Rather than tightly restraining the baby, it flexes with natural movement while gently moderating sudden startle-related motions that may interrupt sleep. \u003c\/p\u003e\n\n\u003ch2\u003eDesigned to reduce fingernail snagging as activity increases\u003c\/h2\u003e\n\n\u003cp\u003e As hand and finger movement becomes more active, small details around the arm area become increasingly important. \u003c\/p\u003e\n\n\u003cp\u003e The inside surface around the baby’s hands is designed with a smoother, cotton-like feel to help reduce the risk of fingernails catching in the fabric while the outer cross-mesh structure continues to provide enhanced ventilation. \u003c\/p\u003e\n\n\u003ch2\u003eAn arms-up shape for the next stage of development\u003c\/h2\u003e\n\n\u003cp\u003e As babies grow, they increasingly extend their arms toward the face and above the shoulders. \u003c\/p\u003e\n\n\u003cp\u003e The M size supports this natural arms-up position while combining an adapted arm shape with responsive fabric tension for babies whose movement has become stronger. \u003c\/p\u003e\n\n\u003ch2\u003eNot tighter swaddling — smarter response to movement\u003c\/h2\u003e\n\n\u003cp\u003e More movement does not mean a baby should simply be wrapped more tightly. \u003c\/p\u003e\n\n\u003cp\u003e MerryTune uses the elasticity and recovery of the fabric to respond to movement: stretching when the baby moves and returning toward a stable fit afterward. \u003c\/p\u003e\n\n\u003cp\u003e This helps preserve natural movement while gently moderating sudden motions that can disturb sleep. \u003c\/p\u003e\n\n\u003ch2\u003eFreedom for healthy hip and leg movement\u003c\/h2\u003e\n\n\u003cp\u003e Upper-body support is balanced with sufficient room around the lower body. The design does not hold the baby’s legs straight and tightly together. \u003c\/p\u003e\n\n\u003cp\u003e The swaddle shape is developed with internationally recognized hip-healthy swaddling principles in mind, allowing the hips and legs to move naturally. \u003c\/p\u003e\n\n\u003ch2\u003eTwo fabrics for two stages of newborn development\u003c\/h2\u003e\n\n\u003cp\u003e Stage 1 Organic Cotton Air Mesh S focuses on softness, delicate skin, and the smaller movements of the earliest newborn period. \u003c\/p\u003e\n\n\u003cp\u003e As strength and activity increase, Stage 2 Performance Tension M provides enhanced airflow, moisture management, quicker drying, and responsive tension. \u003c\/p\u003e\n\n\u003cp\u003e Instead of simply increasing the size, MerryTune changes the fabric and performance structure according to the baby’s developmental stage. \u003c\/p\u003e\n\n\u003ch2\u003eDesigned and made in South Korea\u003c\/h2\u003e\n\n\u003cp\u003e Performance Tension M was developed around the changing movement, sleep posture, heat, and fabric-contact needs of growing babies. \u003c\/p\u003e\n\n\u003cp\u003e The product is designed, developed, and manufactured in South Korea. \u003c\/p\u003e","brand":"MerryTune","offers":[{"title":"Performance Tension M - White","offer_id":43764577108058,"sku":null,"price":29900.0,"currency_code":"KRW","in_stock":true},{"title":"Performance Tension M - Soft Blue","offer_id":43764577140826,"sku":null,"price":29900.0,"currency_code":"KRW","in_stock":true},{"title":"Performance Tension M - Light Beige","offer_id":43764577173594,"sku":null,"price":29900.0,"currency_code":"KRW","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/8604\/7578\/files\/1_1191084f-6925-4b4b-a6e2-0d2f507e3677.jpg?v=1787658320","url":"https:\/\/global.with-merrytune.com\/en-jp\/products\/newborn-performance-swaddle-suit-m","provider":"MerryTune Global","version":"1.0","type":"link"}