"According to data from the CIA's 2005�2006 World Factbooks, the world human population currently increases by 203,800 every day.[8] The 2007 CIA factbook increased this to 211,090 people every day." (Source: Wikipedia)
If each of those babies weighs 3kg, then the Earth is increasing in "weight" by some 633 tonnes per day or 219,000 tonnes per year.
As this increase in population will be taking place unevenly over the surface of the Earth, when will it start to wobble?