OXT and obesity due to melanocortin 4 receptor deficiency: They also argue that “some studies have suggested that obesity increases maternal pelvic soft tissue which narrows the diameters of the birth canal and increases the risk of Caesarian section delivery, which is associated with dystocia, a macrosomic infant, or cephalopelvic disproportion [52], while others have suggested that the increased risk of Caesarean deliveries could be related to differences in labour progression among obese women or their response to oxytocin administration” [52].