I call our son:
Cutie
Buddy
Baby
Babykins
Stinky
Stink-o-Man
Smelly
Lovekins
Smookie Bear
Smookiekins
Lovey
Sweetie Pie
Honey Bear
I'm sure there are more, but that's all I can think of off the top of my head. The nickname I give him usually fits his demeanor at the time. Lately, however, he's "Stinky" more often than not due to his rather sudden ability to annihilate his diaper, his onesie, his shorts, and whatever he's sitting on *instantly* with a single bowel movement. It's rather frightening - I'm pretty sure he's posessed...