Please please please buckle your precious cargo in their car seat correctly! It gives me chills seeing loose straps and/or the chest piece way too low.
You shouldn't be able to pinch any strap material up by baby's shoulders and the chest piece is supposed to be just that, on the upper chest.
I overheard someone once 'Oh no, we forgot the car seat. Eh, it's not far. I'll just hold the child in my arms.' ....No.