If the head rest of the convertible seat bumps into the headrest of your car and cannot go up any higher then yes. If it clears the headrest and there is no interference then no.
Here is the translated text: --- **Brix One4Life Safety Seat** After many recommendations, we purchased two seats. Today, during the first use, we unfortunately noticed that the straps are too short (for 3-month-old babies). The only way I understand to extend the straps is by raising the backrest (the headrest/support), to a level that is not suitable at all for infants, making the headrest too high-however, this does extend the length of the straps. Do you know how to extend the straps without raising the backrest (the head support)? A picture of the seat is attached. ***Of course, we’ve already loosened the straps as much as possible using the button below the padding.
At the front of the seat there is a strap hanging down (where babies feet for when in the car) At the top of the strap where it meets the car seat is a lever. You push that lever down and pull out the straps with your other hand at the same time. To tighten you pull that strap. Make sure the head rest is low enough for the straps to fall below the child’s shoulders for rear facing.
