▁should ▁also ▁be ▁considered ▁should ▁the ▁patient ▁experience ▁morning ▁sick ness . ▁The ▁band ▁may ▁remain ▁def l ated ▁during ▁pre gn ancy ▁and ▁once ▁breast ▁feed ing ▁is ▁completed , ▁or ▁if ▁bott le ▁feed ing , ▁the ▁band ▁may ▁be ▁gradually ▁re - infl ated ▁to ▁aid ▁post part um ▁weight ▁loss ▁as ▁needed . ▁ ▁It ▁is ▁highly ▁ad vised ▁to ▁take ▁extra ▁pre ca utions ▁during ▁inter course ▁after ▁surg ery , ▁as ▁rapid ▁weight ▁loss ▁increases ▁fert ility . ▁Effect ive ▁birth ▁control ▁methods ▁must ▁be ▁used ▁at ▁all ▁times ▁to ▁avoid ▁unw anted ▁pre gn an cies . ▁Two ▁factors ▁have ▁been ▁pointed ▁out ▁by ▁exper ts ▁that ▁may ▁help ▁explain ▁this ▁increase ▁in ▁fert ility : ▁revers al ▁of ▁P CO S ▁( pol yc yst ic ▁ov ary ▁synd rome ) ▁and ▁reduction ▁in ▁the ▁excess ▁of ▁est ro gen , ▁which ▁is ▁produced ▁by ▁fat ▁cells . ▁ ▁Com parison ▁with ▁other ▁b ariat ric ▁sur ger ies ▁Un like ▁more ▁open ▁forms ▁of ▁weight ▁loss ▁surg ery ▁( e . g . ▁R oux - en - Y ▁g astr ic ▁by pass ▁surg ery ▁( R N Y ), ▁B ili op an cre atic ▁di version ▁( B PD ) ▁and ▁Du oden al ▁Switch ▁( DS )), ▁g astr ic ▁band ing ▁does ▁not ▁require ▁cutting ▁or ▁removing ▁any ▁part ▁of ▁the ▁dig est ive ▁system . ▁It ▁is ▁remov able , ▁requiring ▁only ▁a ▁la par os cop ic