My 18 month old daughter loves this book. She loves lifting the flaps, turning the wheel of the weighing machine, pulling out the printed page from the printer, and checking out the treats that Billy and Nell get at the end of the story from their mom for being good patients! This book has helped her in her own doc visits. We cite her Billy and Nell’s reference, whenever her pediatrician uses a stethoscope or otoscope on her and she feels less anxious.