Having children made us look differently at all these things that we take for granted, like taking your child to get a vaccine against measles or polio.

What great changes have not been ambitious?

It's really one of my all-time favorite things to do. To go out and really see the kids and visit the moms who are in these programs because I think I really get to see what happens on the ground and connect with them about what changes are that happen in their lives because of some of the giving that we're able to do.

If we're going to make progress on this issue [of contraception], we have to be really clear about what our agenda is. We're not talking about abortion. We're not talking about population control. What I'm talking about is giving women the power to save their lives, to save their children's lives and to give their families the best possible future.

The biggest pieces of work that we do are vaccines, because those save lives, and also family planning. Because if a woman can space the births of her children, it changes everything for her health and her child's health.

Even in decision-making, we work in self-help groups. That is women coming together in small groups of 10 to sometimes 15 women, where they start to get education about their rights, about clean water and sanitation, about how to have a healthy birth. You can bring in all kinds of education to them that way.

In different places you run into myths around vaccination or around family planning. In the United States, one of the myths that existed for a long time, that has been completely debunked, was that autism was linked to a vaccine.