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They have become the poster children for pronatalism, a movement that believes falling birth rates are a big problem for society.

The conference brings together two strands in pronatalism that come from very different branches of the American right: both conservative Christians and members of the so-called 'tech right,' an ascendant wing that came out of the libertarian, start-up culture of Silicon Valley.

He claims to have engaged in "backroom channelling of influential people, making sure that pronatalism became normal to talk about within the centres of power, and that ended up dripping its way up to administration and core tech culture".

"There's a renewed interest in pronatalism and family promotion among American conservatives," says Timothy Carney, author of Family Unfriendly, How our Culture Made Raising Kids Much Harder than it Needs to Be.

One of those most divisive issues in pronatalism are the mention of certain aspects related to genetics among some of its tech right proponents.