Some 50 governments attended the hastily convened one-day conference. Early on, total pledges were already exceeding 100 million dollars, with Sweden, Canada and Finland each promising 20 million euros (USD 21 million).
One of Trump's first acts as president was to withhold an estimated half a billion dollars a year in funding from international groups that perform abortions or provide information about them.
Officials in many European nations and around the world say Trump's move against family planning will only increase the overall number of abortions and will hurt the women and girls who need it the most.
"The purely ideological decision of one country" can push women and girls back "into the Dark Ages," said conference host Belgian Deputy Premier Alexander De Croo.
"We will start making something great again," he said of the drive to boost family planning policies in developing nations, riffing off Trump's "make America great again" campaign slogan.
Philanthropists and private donors will be asked to contribute as well.
Finnish Development Minister Kai Mykkanen said the US moves "threaten to suspend a large number of projects helping to defend the health of millions of girls, even helping to save their lives. We respond to the situation fraught with distress by investing in the improvement of women's and girls' rights even more than before."
US bans on funding international groups that perform or even talk about abortions have been instituted by Republican administrations and rescinded by Democratic ones since 1984.
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