Turn the blanket 45 degrees and fold down the farthest corner. Place baby with neck over the fold. Bring one side of the blanket across baby and tuck in behind. Bring lower extension of blanket up over the baby, and tuck one side into the same side you tucked the side into. Bring the opposite, remaining side of the blanket across the baby and tuck that in behind.
The result should look like this:




