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Microbiota diversity varied by birth weight and sampling time. Total 404 samples were collected from 134 infants at 0 day, 3 days, 2 weeks, 6 weeks, and 3 months after their birth (defined as different stages range from stage 1 to stage 5) (A). Alpha-diversity of gut microbiota, measured by Shannon (B) and Chao1 (C) index.
