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. 2019 Jul 22;9:10550. doi: 10.1038/s41598-019-46923-0

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Introduction of solid food but not tooth eruption had a significant effect on microbial community composition. Time of tooth eruption was recorded, and samples taken immediately pre- and post- tooth eruption and pre- and post- introduction of solid foods were included in the analyses. On average infants began solid foods at 6.8 ± 0.9 months of age and tooth eruption at 8.7 ± 2.2 months. Bray Curtis Multidimensional Scaling plots with group centroids plotted as square points and box plots for richness and diversity are shown (analyzed by Wilcoxon Signed Rank Test).