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Number of bifidobacteria (mean (SD) log of colony forming units (CFU)/g wet faeces) in the group fed the experimental formula with oligosaccharides (OS formula) and the group fed the unsupplemented control formula (Control). The shaded area indicates the reference range for infants fed human milk (mean (SD) 8.9 (1.8)). The difference between the groups at 28 days was highly significant (p = 0.0008; t test).
