In her sweet Southern drawl, Caroline Harper Knapp says the best way to transition a baby's room into one better suited for a toddler is to start early. That's exactly what she did for her first son, Knox. She originally designed a flexible, modern nursery then filled it with multipurpose furniture that can be used for the long haul. See what accessories and toys Caroline chose to give the space a kid-friendly vibe. Our favorite? The colorful teepee!