Final answer:
The nurse should limit the client's efforts to bearing down during labor when CD is present to prevent complications due to the mismatch between the baby's head and the mother's pelvis.
Step-by-step explanation:
The nurse should limit the client's efforts to bearing down during labor when CD (Cephalopelvic Disproportion) is present. Bearing down increases pressure on the cervix and pelvic floor, and in the case of CD, where there is a mismatch between the size of the baby's head and the mother's pelvis, this can lead to complications. It is important that the laboring mother refrains from pushing until her healthcare provider advises it is safe to do so.