Forward-facing, the straps must be above the shoulders and the tops of the ears below the top of the shell.
Rear-facing, there must be 1" of shell above the head. I realize the Cosco Scenera manual states a 36" maximum for rear-facing. I cannot advise you to disregard the manual, but I will tell you that many techs and advocates ARE comfortable with rear-facing above the stated limits as long as there is 1" of shell above the head.
If you do forward-face, you should have top tether anchors installed. What is the year/make/model of the vehicle?
Rear-facing, there must be 1" of shell above the head. I realize the Cosco Scenera manual states a 36" maximum for rear-facing. I cannot advise you to disregard the manual, but I will tell you that many techs and advocates ARE comfortable with rear-facing above the stated limits as long as there is 1" of shell above the head.
If you do forward-face, you should have top tether anchors installed. What is the year/make/model of the vehicle?