You zip up the full body suit. It feels as if you aren't even wearing it at all, but you are

"If are ready to begin the simulation, please press the green start button and select the stages (month 1, month 2, month 3, month 4, month 5, month 6, month 7, month 8, month 9, and/or labor) you would like to experience and how long you would like the simulation to last. You may press the red stop button at anytime if you are feeling too uncomfortable."