They weigh only 1 to 2 kg at birth. Their eyes open after about two weeks. The cubs suckle not only with their own mother, but also with other lionesses. So each lioness is promoting her own genes, because the females in a pride are closely related. Cubs eat meat from their sixth week and they remain weaned six to eight months.
Newborn cubs have greyish spots in their skin, which fade away in about three months.
People might think that lions do not really care about their cubs. A lot of them die because of starvation and others are killed when a new male becomes the leader of a pride, because he doesn't tolerate the off-spring of other males. But those are the harsh rules for surviving. Even male lions are very affectionate with their own cubs, what is a quite unusual behavior for cats. That is not because of killing our cubs, but because of human hunters.