6 perfectly-sized, sturdy flaps  are extra strong so babies and toddlers can open and close, over and over again. Chunky  board  books  for babies have durable pages and flaps designed to withstand traditional wear and tear. Bright,  cheerful  illustrations  in these sensory lift-a-flap books keep little kids entertained and engaged. Interactive elements encourage sensory exploration and help support the development of  fine  motor  skills  and  hand-eye  coordination  in developing children.