Part of the hubbub surrounding William and Kate's new royal baby includes a critique of the way that George's car seat was (perhaps improperly) installed. Honestly, installing these things can be seriously confusing, but it's important to do it right or your little one won't be protected.
Maryland has many places where you can go to either get help installing a car seat or have a professional check to see that the one you have is secured properly.
For info about car seats and a calendar of safety checks, visit this Department of Health and Mental Hygiene website: http://phpa.dhmh.maryland.gov/ohpetup/kiss/SitePages/Home.aspx