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World Have Your Say is live from Lagos, Nigeria’s biggest city today, tomorrow and Wednesday. So tune in at 1700GMT in the United States or 1800GMT for the rest of the world.

The UN says the global population will hit 7 billion today.  Today, we are broadcasting from Island Maternity Hospital and meeting mums and their new babies. We are going to talk about big families, contraception, maternal health and the strain on provide food, water and resources. The planet has doubled in population since the 1960s.

Africa has the With between 12 million and 17 million people, Lagos is already over populated and thousands of people arrive here each month, and predicted to become by 2014 (it’s currently Cairo).

On Tuesday we’ll be working with a new Nigerian radio station, Nigeria Info 99.3, sister station to Cool FM. It has just launched this month and is broadcasting WHYS every day. You can follow and .

And we could do with your help for Wednesday's show. We’re still looking for a location in Lagos. Any intruiging places you think we could be?

You can tweet us @bbc_whys  post your comments on   or call us during the programme on country code plus 44 20 70 83 72 72 or email us at worldhaveyoursay@bbc.com