A baby only needs to lose 1 ounce of blood to hemorrhage, and just 2.3 ounces to die as a result of this blood loss. It can, and does, occur at a frightening quick pace.
http://www.drmomma.org/2010/05/death-from-circumcision.html

A study published in Thymos: Journal of Boyhood Studies estimates that more than 100 baby boys die from circumcision complications each year, including from anesthesia reaction, stroke, hemorrhage, and infection. Because infant circumcision is elective, all of these deaths are avoidable.
http://www.icgi.org/2010/04/infant-circumcision-causes-100-deaths-each-year-in-us/

"To put this in perspective, about 44 neonatal boys die each year from suffocation, and 8 from auto accidents. About 115 neonatal boys die annually from SIDS, nearly the same as from circumcision."
http://www.examiner.com/family-health-in-washington-dc/new-study-estimates-neonatal-circumcision-death-rate-higher-than-suffocation-and-auto-accidents

Increased morbidity after circumcision from a hidden complication
http://www3.interscience.wiley.com/journal/120710265/abstract

Deaths from circumcision
http://www.circumstitions.com/death.html

Circumcision deaths
http://www.cirp.org/library/death/

“The parents of a 6-week-old boy who bled to death after a circumcision at Rosebud’s Indian Health Service Hospital last year are suing the government for wrongful death.” 
http://www.argusleader.com/article/20090918/UPDATES/90918015/1003/business 

Brooklyn Toddler Dies After Circumcision 
http://abcnews.go.com/Health/Wellness/brooklyn-toddler-dies-circumcision/story?id=13544632#.TuF9ZM2nHxI

One-week-old Ontario infant died from complications after undergoing a circumcision
http://www.canada.com/cityguides/ottawa/story.html?id=cb3b8281-4134-46ba-85d3-b076072bda75&k=25810

Infant's death at Maimonides Hospital linked to circumcision 
http://www.nydailynews.com/new-york/infant-death-maimonides-hospital-linked-circumcision-article-1.1032432

Midwife charged with manslaughter after baby bleeds to death following a circumcision
http://www.oldham-chronicle.co.uk/news-features/8/news-headlines/68777/midwife-on-baby-death-charge

John V. Geisheker, J.D., LL.M., Executive Director of Doctors Opposing Circumcision discusses why circumcision accidents and deaths are underreported.
http://youtu.be/jaWiBzZYG9Y