Britax 'Elite' car seat

Sara
I purchased the britax stroller system with the elite car seat and my only complaint is the extra head restraint piece.
 
I know it is for extra safety but it only slides up and down. It is not removable and my only 9 week olds head is already pretty snug in there. Wont he outgrow this restraint before a year/switching to a convertible seat ? Any other reviews on this product? 

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