Cultivable bacteria in meconium and fecal samples analyzed in this study.

<p>Frequency of occurrence is the percentage of samples in which a particular bacterial genus was detected at each sampling time (meconium, 1^st week, 2^nd week and 3^rd week feces). The total number of weekly samples analyzed is indicated under each sampling time. Results of the Fisher exact probability test (Freeman-Halton extension for a 2×4 contingency table) are shown by asterisks. * = <i>P</i><0.05; ** = <i>P</i><0.01; *** = <i>P</i><0.001.