The average singleton baby is about 51cm (20in) long from head to toe and weighs approximately 3.4kg (7.5 lb) at birth. However, anything between 2.5kg (5.5lb) and 3.8kg (8.4lb) is a healthy weight for newborns. Twins tend to be lighter than singleton babies.
The depression originated in the United States, after a major fall in stock prices that began around September 4, 1929, and became worldwide news with the stock market crash of October 29, 1929 (known as Black Tuesday). Between 1929 and 1932, worldwide GDP fell by an estimated 15%.
The Great Depression, which began in 1929, did not end until the United States was actively engaged in World War II. Some economists believe that the country's entrance into the war -- which spurred increased industrial and labor production for the war effort -- was the primary reason the Depression ended.