The female rhino is pregnant for about 18 months (depending on the species of the rhino), after which only one calf is born. At birth, this calf will weigh between 25 and 45 kilograms. It is born fairly weak but is able to stand up and begin walking within minutes of the birth, an incredible feat for one so young. Within the first few hours of its life, it will begin to suckle milk from its mother, which it will continue to do until about 18 months of age. The mother will allow her calf to drink milk exclusively for the first week or two. After that, she will take it to areas with soft grass and teach it to eat the young, juicy vegetation of the area. The rhino calf is born without a horn.