A new study in the Journal of the American Medical Association reports that about 1 in 10 new dads deal with depression for the first 3 to 6 months. The study found that men were generally happy for the first few days of fatherhood, but after a few weeks of sleepless nights and stressful crying, depression began to set in.
http://jama.ama-assn.org/cgi/content/abstract/303/19/1961
http://news.bbc.co.uk/2/hi/health/8687189.stm