User blog comment:Kaido King of the Beasts/Chapter 802: The Elephant in the Room/@comment-67.204.208.3-20151002134122/@comment-12.106.174.131-20151002175453

Thanks Kaido, though there is no mention of when he had the child vs the youngest point he was using his DF(shown when they were looting and talking about the White City) it does at least suggest he likely had the child after.