At My Toddler’s Birthday Party, One Small Mix-Up Seemed Harmless. Then I Noticed Everyone’s Reaction—and Realized Something Was Wrong.

For a while, there was no conflict at all.

The children played. The adults ate. Ariel ran around the yard with the unstoppable energy only a three-year-old can have.

Then Clara climbed out of the pool wearing a one-piece swimsuit.

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At nearly the same moment, Ariel came running by with a group of kids heading toward the ice cream table.