no one, not even executives like carrie haley, have access to every room. locks on the doors. there is serious business. >> absolutely. security is serious business everywhere. it's diapers. >> yeah. >> reporter: each lab has a numerical lock so they can track who's coming in and out. here they're working on prototypes for new diapers. they are tested for scent, touch, flexibility and durability. >> we want to make sure that as babies are scooting around on their bottom and moving, that that product stays together and stays as intended the entire wear time. >> 23.4 pounds. >> good job. >> yeah, big boy. >> good job. >> reporter: and that's before they bring in the babies for some real-time testing. >> are you posing? >> reporter: this is called a fit and load test. >> hang on tight. >> reporter: fit to make sure they're comfortable. and then the load. >> does that tickle? does that tickle? >> reporter: those bubbles are actually synthetic urine. each diaper is tested for how much it can take before it leaks. >> can we take measurements from this line down t