Car seat question

Does anyone know at what age (or weight) to take these inserts out? The car seat is 4-120 pounds and I want to switch my 9 month old (20lbs) to this car seat from his infant one. He kinda fits awkward in it so I was wondering if I’m supposed to take them out or keep them in until he’s older. I read the instructions and they just say what it is and not how long to keep it in

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