Gabriel Aubry and Halle Berry
Dave Allocca/AP
"I've been in preparation mode for five months," Aubry, 31, tells Extra. "I've read a lot of books."
Any recommendations? "There's a good one that Dr. Phil did [titled] Family First," he says. "Great book. I recommend it."
Aubry has been on top of his expectant-father responsibilities for a while now, telling PEOPLE in September that he's been massaging Berry's feet and satisfying her food cravings.
He also told PEOPLE this week that he's been talking to the baby. "[I] talk in the mic in her bellybutton ... that's what we call it," he said Thursday.
And he offers some more words of wisdom from the trenches for dads-to-be, telling Extra: "Don't say she's fat."
Berry, 41, is due in early 2008.
Aubry was in New York on Thursday night for Wilhemina's 40th anniversary party. He works for the agency as a model.
