Obesity in pregnancy causes all of the following complications except :

Obesity Patient feels uncomfoable and dyspnoeic on exeion hypeension and gestational diabetes difficulty in diagnosis of presentation fetal macrosomia fetal malformations especially NTD increased incidence of abnormal uterine contractions and prolonged labour shoulder dystocia puerperal UTI,PPH venous thrombosis and lactation failure D.C.DUTTA'S TEXTBOOK OF OBSTETRICS,pg no:344,7th edition