Verbal irony is when what is said is the opposite of the literal meaning. One type of verbal irony is sarcasm, where the speaker says the opposite of what he or she means in order to show contempt or mock. Other types of verbal irony include overstatement (or exaggeration) and understatement.
Thanks for A2A. There are two excellent, well-informed answers here, so I'll just try to simplify. Dr. Falconer is of course correct; pre-weaning age (about 9 weeks or younger) kittens can drink cow's milk, or any milk. Neonates are not lactose intolerant; this develops gradually with age.
A young kitten under three weeks old cannot regulate its body temperature, and relies on its mother for body heat. A kitten must nurse from its mother starting at birth until it reaches four weeks old and begins to grow teeth to chew food with. After four weeks old, its mother weans it from her milk onto solid food over a period of approximately six weeks.