Make sure that the chest clip is properly secured and located at armpit level on your child to ensure proper function. (sfnewborncare.com)
- Check the seat's safety harness (in a car, it's especially important that the harness clips are at around armpit level, never on the stomach or neck) (pregnancy-info.net)
The chest clip of the harness should be placed at armpit level, which will keep the straps on the child's shoulders properly. (momtricks.com)