If you are curious about whether your child gets carsick, have no fear. They will definitely let you know. They will chose a moment when they have your undivided attention, such as two minutes after you leave the house for an important event, like family pictures.
Instead of smiling and laughing for that long sought after idyllic portrait, ugly crying while scrubbing vomit from the car in the gas station parking lot, after you strip them of their now ruined, perfectly adorable ensemble, will ensure that important piece of information about them will never be forgotten.
What cannot be explained is how you manage to repress the urge to douse yourself in gasoline and self immolate for daring to want something nice for yourself ever.