Breastfed children showed increased presence and abundance of the lactic acid bacterium Dolosigranulum ( relative effect size -LSB- RES -RSB- , @ ; P = @ ) and Corynebacterium ( RES , @ ; P = @ ) and decreased abundance of Staphylococcus ( RES , @ ; P @ ) and anaerobic bacteria , such as Prevotella ( RES , @ ; P < @ ) and Veillonella ( RES , @ ; P < @ ) .