Author contributions
XLi helped with study design, data analysis, and statistical analysis. JX and YF performed data analysis, statistical analysis, manuscript writing, and literature search. XLi and YF provided nutritional assessment and guidance for pregnant women, and LT provided weight advice for pregnant women. XLi, YF, JC, ZL, FY, and LT answered questions for pregnant women. JX and YF contributed equally to this work and shared the first authorship. JX, HG, XYL, JD, LK, and JW participated in the data collection and collation. All authors contributed to the article and approved the submitted version.