Below are some links to further information and studies. Check it out if you're interested!
Single-use nappies and their alternatives: Recommendations from Life Cycle Assessments
Disposable Nappies: Are they stinking up our planet?
University of QLD Lifestyle Assessment Study (2009)
Scrotal temperature is increased in disposable plastic lined nappies
Toxins in disposable diapers
CHOICE - Disposable Vs Cloth which nappy is best?