U.S. organization Having Kids started urging the royals to stop at two children even before the announcement revealing Kate's pregnancy. Following the Duchess's joke in Prague about wanting another baby, the group wrote an open letter to the royals about the importance of small families for the world's resources.

美国富人Having Kids机构曾在凯特宣布怀孕前强烈建议皇室只要两个孩子就够了。之后凯特王妃在布拉格曾开玩笑说道想再要一个孩子，然后该机构就像她写了一封公开信，旨在说明少养孩子对世界资源的重要性。

"As you know and appreciate, the example the British Royal Family sets is extremely influential. Many studies also show that public figures serve as effective role models when it comes to family planning. Your discussion of having a larger family raises compelling issues of sustainability and equity," reads the letter.

信中是这样陈述的，“你们都应该明了,皇室就是绝对的标杆，影响力很大。许多研究表明普通家庭在做计划生育的时候都会参照皇室来制定。你们选择多要孩子无疑会引起可持续和公平方面的问题。“

"Large families are not sustainable," it continued, citing the impact that family planning has on climate change, and the well being of children overall.

信中还说“家庭成员多，一点也不可持续。”计划生育总是不仅对气候有影响，还关乎到孩子的健康。

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