1. Population Reference Bureau & The World Factbook (Central Intelligence Agency) https://www.cia.gov/library/publications/the-world-factbook/fields/2054.html
2. United Nations, Department of Economic and Social Affairs, Population Division 2009 World Fertility Data 2008 (POP/DB/Fert/Rev2008)
3. Procter & Gamble Data on File Global Survey Data collected 2007-2009
4. Bowel Movements. “What are some of the basics of infant health?” http://www.nichd.nih.gov/health/topics/infantcare/conditioninfo/Pages/basics.aspx
5. Urination during the first three years of life;Goellner;Nephron,1981