The pair recently filmed scenes showing Kat and Alfie reunited with baby Tommy, months after they thought they had lost him to cot death. Reports suggest that Ronnie Branning, who swapped Tommy with her late son James at New Year, will soon come to her senses on screen and finally give the child back.
Discussing the Moons' reunion with Tommy, Wallace told All About Soap: "It's so lovely having the chance to work with a baby all the time. It's made me really broody.
"But it's definitely not going to be easy for Kat and Alfie. They've grieved for the death of their child. They thought they'd buried him, and now they've suddenly got him back. That's a massive thing to deal with."
Richie added: "While Alfie happily throws himself into being a dad to Tommy, it's Kat who's going to be finding things difficult."
More trouble ahead for the Moons has been rumoured for some time, as one report recently suggested that Kat will struggle to bond with Tommy following the shock development.
Asked whether Kat will want revenge against Ronnie, Wallace replied: "Almost certainly! I'm sure that Kat's too much of a feisty person just to let that one go."
Kat and Alfie will get Tommy back next month.
> More EastEnders Ronnie shocks revealed?
> Click here to read our EastEnders spoilers