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. 2021 Aug 18;12:691312. doi: 10.3389/fmicb.2021.691312

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Copyright © 2021 Long, Hu, Tao, Chen, Shu, Zheng and Jiang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flow diagram of the study. The diagram showed the fecal samples collected at 9 time points. x, fecal samples were not collected by parents as the infants had no defecation.