▁failed , ▁putting ▁the ▁First ▁Family ▁and ▁nation ▁into ▁m our ning . ▁Three ▁months ▁later , ▁his ▁death ▁was ▁e cli ps ed ▁by ▁his ▁father ' s ▁assass ination , ▁but ▁the ▁Kennedy ▁infant ' s ▁death ▁brought ▁h yal ine ▁memb rane ▁disease ▁( H MD ) ▁into ▁the ▁public ▁conscious ness ▁and ▁inspired ▁further ▁research . ▁ ▁Biography ▁ ▁Background ▁In ▁August ▁ 1 9 6 3 , ▁the ▁ 3 4 - year - old ▁Jack ie ▁Kennedy ▁was ▁in ▁her ▁third ▁year ▁as ▁First ▁Lady ▁and ▁in ▁the ▁third ▁trim ester ▁of ▁her ▁fifth ▁pre gn ancy . ▁She ▁had ▁suffered ▁a ▁mis car riage ▁in ▁ 1 9 5 5 , ▁followed ▁the ▁next ▁year ▁by ▁a ▁still born ▁baby ▁girl ▁they ▁planned ▁to ▁name ▁Arab ella ▁( after ▁the ▁Ar b ella ▁ship ). ▁Two ▁health y ▁children ▁had ▁followed , ▁Caroline ▁in ▁ 1 9 5 7 ▁and ▁John ▁Jr . ▁in ▁ 1 9 6 0 . ▁As ▁John ▁had ▁also ▁been ▁prem ature , ▁she ▁asked ▁her ▁obst et ric ian , ▁John ▁W . ▁Wal sh , ▁to ▁accomp any ▁her ▁when ▁she ▁and ▁her ▁children ▁spent ▁the ▁summer ▁in ▁Hy ann is ▁Port , ▁Massachusetts . ▁Near by ▁Ot is ▁Air ▁Force ▁Base ▁Hospital ▁had ▁also ▁prepared ▁a ▁suite ▁for ▁her ▁in ▁case ▁it ▁was ▁necessary . ▁ ▁On ▁the ▁morning ▁of ▁Wed nes day , ▁August ▁ 7 , ▁ ▁Jack ie ▁Kennedy ▁took ▁Caroline ▁and ▁John ▁Jr ▁for