When adjusting the harness part of the seat the straps in front seem not to be measured right so when you try to make it tight the anchor that holds both straps stops it but there is still lack in the strap you pull at the bottom. So when having an infant in the car seat which it is made for you can’t tighten it anymore to safely secure the infant. Also same brand and model and make car seat this harness doesn’t stay secure in the anchor that holds the two straps as you pulling to adjust the straps it comes lose and comes off. Find your self in route and infant has pulled the strap free from the anchor.