"Mean labor pain scores were significantly higher in control group than immersion bath (IB) group suggest that use of IB as an alternative form of pain relief during labor. WI in primipara at any stage of labor, from 2 cm external opening of the uterine cervix, significantly decreased parturition duration compared with traditional delivery. It raised both the amplitude and frequency of uterine contractions proportional to uterine cervix gaping with no disturbances in contraction activity of the uterus. A 3-cm gaping of uterine cervix is the optimal timing for WI in the primipara because earlier WI at 2-cm uterine cervix gaping also accelerated the labor but required repetitions of WI or use of oxytocin for correcting weakened uterine contraction. In contrast, IB did not influence the length of labor and uterine contractions frequency. However, contractions length was statistically shorter in IB and it can be an alternative for woman's comfort during labor, since it provides relief to her without interfering on labor progression or jeopardizing the baby. WI during first stage of labor reduces the use of epidural/spinal/paracervical analgesia/anesthesia compared with controls and there is no evidence of increased adverse effects to fetus/neonate or woman from laboring in water or water birth. Neonatal swimming can accelerate babies growth in early stage. In a microbiological study, comparing neonatal bacterial colonization after water birth to conventional bed deliveries with or without relaxation bath showed no significant difference between three groups in neonatal outcome, infant's and maternal infection rate."