The Carrier is designed to allow your baby's spine to grow healthy in the right posture while the baby is sitting on the Baby Carrier. The strap is recommended to use for baby more than 4 months. 4-6 months old child:front back style At this point the baby's neck muscles have not developed well,can not support the head well,so it is best to use the front back style.Let the baby facing the parents, parents can facilitate timely observation of the baby's condition,to avoid pressure due to straps mouth and nose and avoid Danger of suffocation. 6-10 months old baby:front back style At this point the baby can not sit well,using the front back style,but can make them face outward to meet the baby's curiosity to the outside world. 10 months or more baby:back style Tip:Whether it is before or after the back,parents have to observe the baby at any time,to avoid the danger of extrusion. How to use 1.First,Mom put the baby a flat next to waist and then put on the strap,buckle the strap buttons and tape. 2.And then carefully put the baby inside the strap,pay attention to hold the baby's head,and then fasten the strap before and after,all the buckles on the strap are buckled.Should not be too tight nor too loose. Baby carrying strap will be very comfortable. 3.Everything is ready,the mother can rest assured that carry the baby up. Cautions: 1.Load-Bearing Capacity:Birth to 2-Year-Old Baby. 2.Please Do Not Face to Baby Back,Must Face to Face with the Mother. 3,Strap is Only Suitable for Sitting,Standing and Walking. 4.Before Use this Strap,Carefully Check Buckle is Buckled Well,Adjust the Strap to the Comfort Level for You and Baby. 5.For Your Comfort and Baby,the use of Time Should Not Exceed 2 Hours,Do Not Use the Baby within 30 Minutes after Eating Milk,In Order to Avoid the Baby is Not Comfortable.