Redsand Canyon Cyberiad theory.

Of course Nealy the Fatass wasn't hungry; he'd spent the last week-and-a-half hogging all of mom's teats, manspreading himself as he pleased and edging out his comparatively puny sister. 

...Or so Alivia would have thought, if she had been old enough to have such thoughts. 

Alivia's nose worked the air curiously, her interest piqued. She wiggled eagerly to the offered sustenance and latched quickly. It tasted different from Mom's, but beggars could hardly be choosers.