4 advantages of breast milk

A student who had not studied was writing
his final exam for life science. The question
he couldn’t answer: “Give 4 advantages of
breast milk.”
What to write? He sighed & began to
scribble:
1. No need to boil.
2. Cats can’t steal it.
3. Available whenever necessary.
One more, what to write? He frowned.
Then he triumphantly scribbled his final
answer:
4. Available in attractive containers.