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The primary function of oxytocin is to increase uterine contractions during childbirth. This hormone plays a crucial role in the labor process, as it stimulates the smooth muscles of the uterus to contract, helping to facilitate the delivery of the baby. In addition to its role in childbirth, oxytocin is also involved in bonding and social behaviors, but its most recognized physiological function is the promotion of labor through the regulation of uterine contractions.

While oxytocin does have other functions in the body, such as being involved in lactation by promoting milk ejection (which is distinct from stimulating milk production itself), its direct influence during childbirth is its most significant and well-known role. The other options pertain to different hormones and bodily functions that are not associated with oxytocin.