The female tiger's vagina will open and she will push out the cubs who will be slimy and wet. She then licks the cubs until their fur ruffles and she nips the sac to release the baby and let it breath.
Cubs open their eyes a few week later and start walking. They will nurse for some time then be weened. If a mother weens her cubs too early that could be bad. They will soon grow in baby teeth which will hurt the mother's teeth when they nurse. A mature male tiger may even mate with his own sister or mother.