ent ▁influen za ▁v acc ine ▁during ▁the ▁first ▁trim ester ▁of ▁pre gn ancy , ▁but ▁that ▁the ▁v acc ine ▁was ▁still ▁recommended ▁outside ▁the ▁first ▁trim ester ▁and ▁in ▁special ▁circumstances ▁such ▁as ▁pan dem ics ▁or ▁in ▁women ▁with ▁certain ▁other ▁conditions . ▁The ▁CD C ' s ▁Ad vis ory ▁Committee ▁on ▁Im mun ization ▁Pract ices , ▁the ▁American ▁College ▁of ▁Ob st etr icians ▁and ▁Gy ne colog ists , ▁and ▁the ▁American ▁Academy ▁of ▁Family ▁Phys icians ▁all ▁recommend ▁routine ▁flu ▁sh ots ▁for ▁pre gn ant ▁women , ▁for ▁several ▁reasons : ▁ ▁their ▁risk ▁for ▁serious ▁influen za - related ▁medical ▁comp lications ▁during ▁the ▁last ▁two ▁trim esters ; ▁ ▁their ▁greater ▁rates ▁for ▁flu - related ▁hospital izations ▁compared ▁to ▁non - pre gn ant ▁women ; ▁ ▁the ▁possible ▁transfer ▁of ▁mat ernal ▁anti - infl uen za ▁ant ib od ies ▁to ▁children , ▁protect ing ▁the ▁children ▁from ▁the ▁flu ; ▁and ▁ ▁several ▁studies ▁that ▁found ▁no ▁harm ▁to ▁pre gn ant ▁women ▁or ▁their ▁children ▁from ▁the ▁v acc in ations . ▁ ▁Despite ▁this ▁recommendation , ▁only ▁ 1 6 % ▁of ▁health y ▁pre gn ant ▁US ▁women ▁survey ed ▁in ▁ 2 0 0 5 ▁had ▁been ▁v acc in ated ▁against ▁the ▁flu . ▁ ▁Ing red ient ▁concerns ▁Al umin um ▁comp ounds ▁are ▁used ▁as ▁imm un olog ic ▁adj uv ants ▁to ▁increase ▁the ▁effect iveness ▁of ▁many ▁v