Ask HN: Why do human babies cry?

I read some articles on this a while ago and the answer is quite interesting. Other animals do cry, but crying with tears is learned behavior. It all boils down to getting attention for the purpose of getting fed.

http://www.nytimes.com/2005/03/08/health/a-darwinian-look-at... http://www.froes.dds.nl/Tears.htm