7th billionth baby born. Is medical advancement going to be the death of us all?

I heard that by 2020 the world will reach 20 billion. Our population continues to grow as we continue to cure illnesses that would’ve other wise kept the population numbers at bay.
Is this something we should worry about? Or do you think mother nature will solve that problem with plagues, fertility problems, and droughts?
Or will it simply mean more wars for land and resources and we will kill each other off?