It has become de rigueur to complain about how arduous the whole thing is, one-upping each other over whose baby sleeps the least, chucks the most and who has fewer hours in the day.

母亲们总是抱怨养育宝宝有多么艰难，互相比谁的宝宝睡得最少，乱丢东西最多，比谁每天得时间最少。 这俨然已经变成一种社交方式了。

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Whose baby is it?

NEWYORKER: Midnight in Dostoevsky

It is a finding that begs questions for scientists like Perera about how these chemicals might be influencing the baby - whose ability to fend off toxic chemicals is considerably less than adults - while it develops in utero.

CNN: Toxic chemicals finding their way into the womb