During the first stage of water labour, when should a woman be allowed to enter the pool?

The recommended practice is to allow a woman to enter the pool during the first stage of labor when she has reached established labor, typically around 4 to 5 centimeters of cervical dilation. At this point, labor is more likely to have progressed significantly, and immersion in water can provide pain relief and enhance the experience of labor.

Entering the pool too early, such as when labor is less than 4 centimeters, may not yield the same benefits, as the intensity and regularity of contractions may not be sufficient to take advantage of hydrotherapy's calming effects. Similarly, simply having contractions doesn't guarantee that labor is progressing effectively; the key is the dilation measurement which indicates established labor.

Allowing time for labor to progress to at least 4 to 5 centimeters promotes a more effective use of water immersion, aligning with evidence-based practices that support comfort and pain management in labor.