You cannot put anything under the seat to make it less reclined, you can only use a rolled towel/noodle to make a seat MORE reclined, and in that case you put it in the seat bite area.Â
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For infant bucket seats, they must be at 45 degrees, so you only have one choice with an infant seat. Â Â
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30-45 degrees is for convertible seats only, Â The Truefit is 35-45 degrees, and others only allow 45degrees like the complete air (although many choose to install it more upright). Â Â For older, heavier kids, I like to install seats more upright, for infants, I install closer to 45degrees, more upright as they gain head control (even when sleeping, you don't want too much head flop when they sleep for young babies)
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Is the adjuster thing on the base that adjusts the angle all the way flat? Â Check that first and also try the 'pull the seat out from the seat bite, push where baby's feet go as you tighten' thing. Â That often helps.Â
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Can you install in a different seating position? Â The middle is only a tiny bit safer, but a correctly installed seat is always safer than one that is not installed correctly. Â In my car, I have to have ds's seat outboard because it over-reclines in the center. Â
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