You Must n't Swim... by Rudyard Kipling
You must n't swim till you're six weeks old,
Or your head will be sunk by your heels;
And summer gales and Killer Whales
Are bad for baby seals.
Are bad for baby seals, dear rat,
As bad as bad can be;
But splash and grow strong,
And you can't be wrong,
Child of the Open Sea!