Final answer:
Regular urination can increase space in the woman's pelvis during labor by relieving pressure on the bladder and creating more room for the baby.
Step-by-step explanation:
The nursing intervention during labor that can increase space in the woman's pelvis is to encourage regular urination.
When a woman is in labor, encouraging her to urinate regularly can help create space in the pelvis by emptying the bladder. A full bladder can obstruct the baby's descent through the birth canal and decrease the space available for the baby to move. Regular urination can help relieve pressure on the bladder and create more room for the baby.