A calf (plural calves) is a young domestic cow or bull. "Calf" is the term used from birth to weaning, when it becomes known as a "weaner" or "weaner calf", though in some areas the term "calf" may be used until the animal is a yearling. The birth of a calf is known as "calving".

Calves are born after nine months. They usually stand within a few minutes of calving, and suckle within an hour. However, for the first few days they are not easily able to keep up with the rest of the herd, so young calves are often left hidden by their mothers, who visit them several times a day to suckle them. By a week old the calf is able to follow the mother all the time.

More Info: en.wikipedia.org