Members of a generation are linked through shared life experiences which create a bond tying members together in what has been termed cohorts. Thus generational cohorts are groups of individuals who were born during the same time period and who experienced similar events during their formative years.
Baby elephants a.k.a calves are pretty large when they are born. They weigh around 250 pounds when they are born and can stand at around 2.5 feet tall.
An Asian elephant is pregnant for 645 days while an African elephant is pregnant for 640 days. But it can be 21-23 months long. [ Source: http://www.chacha.com/question/how-long-are-elephants-pregnat ]