My sister in law is having twins. We're invited to her showers and I'm at a loss as to what to buy. I know all of the things that have been most helpful to us thus far: Velcro swaddles, bouncy seats, high end baby swing, boob like bottles, quantities of clothing and swaddles that stretch my laundry intervals, etc. What I don't know is, what things might be uniquely helpful to parents of twins? She's registered for everything and the kitchen sink but it completely open to whatever she receives. HELP moms of multiples! I know you're out there!