Union, 41, knew about the child before she accepted the Miami Heat guard’s proposal on Dec. 21, a source tells the show, and the pair worked through the issue privately.
Wade, 31, has reportedly known the baby’s mother for years and recently visited with his new son.
Wade spoke to Jay Leno on “The Tonight Show” in September about the break from Union, whom he had dated since 2009. The separation was largely due to the demands of their work lives, he explained.
“Celebrity relationships [are] very hard,” he says. “This was a big year for us and our relationship from the standpoint of she was shooting her show “Being Mary Jane,” going most of the year. I was dealing with my injuries, trying to win a championship, so we kinda took a step back.”