If, by chance, your 19 month old manages to lock herself in the bathroom, don't panic. Don't call your husband on his cell phone and hysterically ask, "What should I do?" Don't take the doorknob apart. Don't call the fire department.
What you should do is calmly look above the door sill for the tool to unlock the door. Or you could go in the garage and get a big screwdriver and mallet and take off the hinges, which is what the firemen eventually did.
The little boys really got a kick out of seeing the big red fire engine stop in front of our house. I'm grateful they didn't get to hear the siren as it came down our block. What the neighbors must think, "Those people with ALL those kids have only been here a week, I wonder what they are going to do next?"