KBot visited Jackson while he was doing a play in the UK in March 2005, so Suri would have to be a December baby for the timeline to fit. I don't think Suri resembles him particularly, though.
The only problem I have with the "gave birth earlier than April" is that she never looked 9 months pregnant around December/January. That belly kept going up and down and up and down.
This just about melts my cold blackened heart.
Does Ricky have a partner? Is the mother of the twins going to be involved in their lives, like with Clay's?