It is a terrible design flaw on BMW's part, IMHO. I was extremely frustrated each morning trying to buckle my son up (he is 6 and uses a booster seat) until I found the "Bubblebum" booster seat, which is the narrowest booster seat available and is recommended by the IIHS as a "Best Bet". This one fits perfectly but it takes sometime to learn how to thread the seat belt through. If your child is the right size, this can solve your problem.
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