What can a fast-moving consumer goods company do when its markets just aren't moving fast enough nor its consumers doing a good job of consuming? Sign up new customers when they are young…very young. RB, the maker of such well-known brands as Lysol and Vanish, has agreed to pay $16.6 billion to acquire Mead Johnson, the baby formula maker. Including debt, the deal has been valued at $17.9 billion. RB CEO Rakesh Kapoor had been trying to do a big deal since losing out on a bid for M...