If your toddler starts throwing up at 4:30 a.m. on the morning you're heading home from Disneyworld, remain calm. The people at Disney have seen it before. They will come and change your sheets before you can say Bippity Boppity Boo.
However, if hours later said toddler does not seem interested in food, do not push her to eat. Not even saltines. Not even if you think she's starving.
And then, heavens! Do not follow up said saltines mistake by proffering red Gatorade. Do not, do not, do not!