"I've received hate mail in the past from some parents after they've read about the studies, but often find that many parents feel liberated by the research," she said.

“我过去曾收到一些父母在阅读研究报告后发来的恐吓信件，但常常发现，也有很多父母觉得研究让他们恍然大悟，”她说。

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"I've received hate mail in the past from some parents after they've read about the studies, but often find that many parents feel liberated by the research, " she said.

CNN: Does having children make you happy?