Bebelusii care cantaresc mai putin de doua kilograme sau care se nasc inainte de cea de a 37-a saptamana de sarcina au mai multe sanse sa aiba o sanatate fragila, handicapuri motorii sau lingvistice sau probleme de invatare decat bebelusii cu o greutate normala si nascuti la termen. Bebelusii nascuti cu o greutate mai mica de 2 kilograme supravietuiesc in general, dar au sanse mai mari de a avea probleme de sanatate serioase, spune Michael Speer, medic la Baylor Medical School, care nu a fost implicat in realizarea acestui studiu. Cercetarea demonstreaza ca bebelusii nascuti de mame cu varsta mai mare de 35 de ani pot avea: – intre 20 si 40% mai multe sanse de a se naste cu o greutate mai mica decat cea normala; – sanse cu 20% mai mari sa se nasca prematur; – sanse cu 20% mai mari sa aiba un frate geaman. in cazul mamelor mai in varsta, imbatranirea uterului si bolile precum hipertensiunea pot afecta fatul, spune conducatoarea studiului, Suzanne Tough, de la Facultatea de Medicina din Calgary. Mamele mai in varsta insa au o situatie financiara mai buna si majoritatea nu fumeaza, ceea ce reprezinta o compensatie pentru dezavantajele biologice.
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