To hide her pregnancy, Bree had Danielle "disguised" as her own mother—a pregnant Bree—complete with a matching outfit and haughty attitude.
Vengeful as ever, Edie visits Gabrielle's husband, Victor Lang, and shows him incriminating photos of the two together, setting off a major conflict for the rest of the season. [S4E6] Now I Know, Don't Be Scared
Mike tries to defend his father as a man who simply "snapped" after being passed over for a promotion, but the father's lack of remorse deeply unnerves Susan. To hide her pregnancy, Bree had Danielle "disguised"
While it seems like a comedic subplot, the possum serves as a metaphor for the cancer Lynette was battling at the time. To hide her pregnancy