Your Baby's First Year by the American Academy of Pediatrics, in a chapter about very young babies, includes the following paragraph:
The best way to handle crying is to respond promptly to your infant whenever he cries during his first few months. You cannot spoil a young baby by giving him attention; and if you answer his calls for help, he'll cry less overall.
I wonder what evidence there is for "You cannot spoil a young baby by giving him attention". Was there, perhaps, a longitudinal study done of children who were paid less and more attention, and how spoiled they were — which I take to mean how much attention they demanded — when they were older? Is the claim pure conjecture on the AAP's part? Or what?
 It's actually edited by one Steven P. Shelov, but has the imprimatur of the AAP. The edition I'm quoting from is the June 1998 Bantam edition, ISBN 0-553-57904-5, and the quotation is from page 52.