The days of three and four billion were not officially noted, but the International Database of the United States Census Bureau places them in July 1960 and April 1974 respectively.
[11] The International Programs division of the United States Census Bureau estimated that the world population reached six billion on 21 April 1999.
[13] At midnight he went to Koševo Hospital, where Adnan Mević, born at 12:01 am, was named the symbolic 6 billionth concurrently alive person on Earth.
[18][19] Ban Ki-moon did not choose a symbolic seven billionth baby, but several groups proposed candidates: Nargis Kumar of Uttar Pradesh, India,[20] Danica May Camacho of Manila, Philippines[21] and Wattalage Muthumai of Colombo, Sri Lanka.
[23] Among babies born that day who were symbolically named as the world's eight billionth by various government agencies were: Vinice Mabansag (Tondo, Manila, Philippines);[24][25] Damián Ferrera (Santo Domingo, Dominican Republic);[24] and Arpi Kocharyan (Tsovinar, Armenia).