Your baby's neck rests in the web between the thumb, index finger and palm of your hand, forming a «second neck» for baby. (pregnancy-info.net)
This is especially true when it comes to the head and neck rest where the foam can be found. (earlymomentsmatter.org)
Ensure the pouch of fabric is well tucked up between your baby's side and your tummy so he is resting as if in a hammock, slightly turned towards you, bent knees above bottom, feet outside the carrier, with his head and neck resting on your arm. (usa.oschaslings.com)