Calves don't grow into cows. They stay small and you brush them as opposed to milking them.
It stays a calf forever
One day.
As long as the cow thinks it is necessary to hide that calf. Usually a cow will hide her calf for a week or two after birth until the calf is strong enough to be up, running and playing with the other calves.
A cow is a mature female bovine that has had a calf. She was a heifer before she had her first or second calf.
The name of a baby cow is a Calf
If you put your cows in a dairy farm, then put a bull (they wonder ARound friends farms,) in it, when you harvest, a calf may be born.
A cow that has NEVER had a calf in her lifetime is called a Heifer. A cow that has not had a calf YET is a heavily pregnant or heavy-bred, or a short-bred or long-bred cow. A cow that has not had a calf during a calving season is called a barren cow, an open cow, a cystic cow, a cull cow, a meat/slaughter cow, a poor cow, a free-loader, etc.
The baby is called a calf and mother is a cow. Together they are called a cow-calf pair, or "mom and baby."
It takes two years for a cow to mature from calf.
Cow. Calf came after.
Hopefully, if the cow has good milk and you take care of the cow and calf properly. It often will take a calf between 10 minutes and 2 hours for him to eventually stand on his own and start to nurse. So be patient.
A "calf".