The UN Population Division prospects an increase of population from 6.512.276.000 (2005) to 6.908.688.000 (2010).
That means a net increase of 396,412,000 people in five years, meaning a net increase of 217,212 people/day or 150 more people/minute.
Source: Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat, World Population Prospects: The 2008 Revision, http:/esa.un.org/unpp, Friday, June 26, 2009; 3:41:46 AM.
It is estimated that approximately 250,000 to 300,000 people die each day (see
http://wiki.answers.com/Q/How_many_people_die_a_day).
250,000 deaths per day is 173 deaths per minute. If there are 173 deaths per minute and a net increase of 150 people per minute, then there are 323 births per minute. (+323/min - 173/min = +150/min).
300,000 deaths per day is 208 deaths per minute. If there are 208 deaths per minute and a net increase of 150 per minute, then there are 358 births per minute. (+358/min - 208/min = +150/min).
323 births/minute is 465,120 births/day. 358 births/minute is 515,520 births/day. The average of these two is 340 births/minute or 489,600 births/day.