In January 2017, Business Insider published the results of a parents' poll. They asked a group [size undisclosed] of adults with children of various ages "to weigh in on the financial side of having kids" and specifically, to list the parenting splurges they thought were well worth the money.
Sixteen expenses came out on top; among them: "summer camp," "educational resources," and "studying abroad."
You can read the article here.