My belly jiggles now!

I never realized hiw much weight I've gained untill my belly started bouncing around at work. My job i go up and down stairs all the time. Lately I've noticed that my belly jiggles and bounces with every step i take, ESPECIALLY on the stairs! Yesterday my belly bounced right out of my shirt while I was running down the stairs. Now i have to hold my belly like a pregnant woman to keep it from bouncing around.