When can I use the carrier as a backpack?
The child MUST be able to sit upright unassisted (approximately 6 months old) and MUST be in the face-in position before using the carrier as a backpack. A second person should help put the carrier with the child on your back before you pull the parent straps over your shoulders.
From the official Evenflo All-in-One Convertible Car Seat manual, page 9
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