Tops reasons familys decide to use cloth diapers.

#1 Economy: Cloth diapers are much less expensive than single use "disposable" diapers. Based on varying estimates parents can spend from $1500 up to $3000-$4000 on disposable diapers over a 3 year period. Depending on what type of diapers and how many you purchase you can save hundreds, even thousands of dollars by using cloth. They can even be reused on more than one child if cared for properly. Save even more money by using cloth wipes. If you sew you can easily make your own diapers and wipes.Many people also buy excellent condition used diapers. This can cut your cost in half or more.
#2 Environmental: Cloth diapers do not add any waste to the landfills. They can be washed and reused hundreds of times. Biological waste is disposed of properly in the waste water system. Cloth diapers use less energy to produce and to use than disposable diapers.
#3 Better for your baby: Cloth diapers do not contain hazardous chemicals like disposable diapers do (Superabsorbant Polymers and perfumes) Disposable diapers have even been linked to male infertility due to the excessive heat that being diapered in disposables can cause (http://www.obgyn.net/newsrx/general_health-Male_Infertility-20001023-12.asp). Cloth is cooler and more breathable.
#4 Easier toilet training: Cloth diapers allow your baby to feel wetness and this can make toilet training easier. On average cloth diapered babies toilet train faster.
More information can be found here: http://www.realdiaperassociation.org/diaperfacts.php