How Big Is Mama&rsquo;s Belly Baby Shower Game Pregnant Mother to Be (Size: 20 ft. x 3") "How Big Is Mama's Belly" Game. This classic shower game encourages guests to mingle and have a little fun with your guest of honor! Ask each guest to cut off a section of the tape with their best guess on mama's waist size. When everyone has made their guess, it's time to see who's the winner. Ask the Mother of Honor to stand up and hold the tape as you place it around her waist measuring the circumference. Compare the length of mom and baby to the tape length of all the guests. Whoever is closest wins! Tape is made of durable plastic, so be sure to use scissors to cut off each piece. Our "How Big Is Mama's Belly" Game tape pieces can be kept as keepsakes for the expectant mother. Just ask everyone to write their name and a brief message on the back of the tape with a permanent marker! 20 ft. x 3". Tape is made of durable plastic.