The baby in this picture is 9 months old. I have been carrying him using this technique since he was 1 month old. As he grew, my back got stronger!
Step 1: Find a rectangular cloth
Step 2: Put the cloth at your waist
Step 3: Baby goes on the back
Step 4: Cover baby's bottom and back
Have the person assisting you adjust the bottom edge of the cloth so that it fits underneath the baby's bum. The baby's legs (from the knees down) must not be covered.
The top part of the cloth will go up to the baby's shoulders (older babies can leave their shoulders uncovered, younger babies need more support).
Take the right side of the cloth and put it over your right shoulder.
The left side goes under your left armpit.
Step 5: Tie in front
tie it twice and slowly come out of your leaning position.