The actress has now told Us Weekly that she "definitely" wants to have more children.
"I think we decided on three," she said. "But I'm pushing for four!"
Heigl also described Adalaide as "a delicious, beautiful, wonderful child", adding that Naleigh is "more charming, more gregarious, more outgoing, never stops talking - so she's got all this personality, and now I've got this tiny little being who can't really see even yet".
"They're both just so enthralling," she said. "It's just been so unbelievable."
Watch Katherine Heigl in the trailer for One for the Money below: