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Purpose <p>We aimed to assess the association between postpartum weight retention (PPWR) in the 4th-week post-delivery and the risk of large-for-gestational-age (LGA) infants in the second pregnancy.</p> Methods <p>This nationwide prospective birth cohort analysis included 3137 women who delivered their first two live singletons between 2011 and 2014. The PPWR was defined as the body mass index (BMI) after 4 weeks of the first birth minus the pre-pregnancy BMI of the first pregnancy. LGA infants were compared among four PPWR groups: less than − 1 (a BMI loss of &gt; 1 unit), − 1 to &lt; 1 (the reference: stable PPWR group), 1 to &lt; 3 (a BMI gain of 1–3 unit) and ≥ 3 (a BMI gain of &gt; 3 unit). PPWR was assessed not only in all women but also in women with a BMI &lt; 25 and ≥ 25&#xa0;kg/m<sup>2</sup>, and adjusted odds ratios (ORs) were calculated for LGA infants by multiple logistic regression.</p> Results <p>The incidence of LGA infants was 8.8% (277 out of 3137). After adjusting for potential confounding factors, no association was observed between the risk of an LGA infant in the second pregnancy and the PPWR in all eligible women. Similarly, no association was observed between LGA risk in the second pregnancy and thePPWR in the pre-pregnancy BMI &lt; 25&#xa0;kg/m<sup>2</sup> (normal) and ≥ 25&#xa0;kg/m<sup>2</sup> (overweight/obese) groups.</p> Conclusion <p>PPWR measured in the 4th-week post-delivery was not associated with an increased risk of LGA infants in the second pregnancy.</p>

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Association of postpartum weight retentions at 4 weeks with large-for-gestational-age infants in the second pregnancy: the Japan environment and children’s study

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Satoshi Shinohara,
  • Reiji Kojima,
  • Sanae Otawa,
  • Megumi Kushima,
  • Kunio Miyake,
  • Hideki Yui,
  • Tadao Ooka,
  • Hiroshi Yokomichi,
  • Zentaro Yamagata,
  • Ryoji Shinohara,
  • Michihiro Kamijima,
  • Shin Yamazaki,
  • Maki Fukami,
  • Reiko Kishi,
  • Chiharu Ota,
  • Koichi Hashimoto,
  • Chisato Mori,
  • Shuichi Ito,
  • Hidekuni Inadera,
  • Takeo Nakayama,
  • Ryo Kawasaki,
  • Yasuhiro Takeshima,
  • Seiji Kageyama,
  • Narufumi Suganuma,
  • Shoichi Ohga,
  • Takahiko Katoh

摘要

Purpose

We aimed to assess the association between postpartum weight retention (PPWR) in the 4th-week post-delivery and the risk of large-for-gestational-age (LGA) infants in the second pregnancy.

Methods

This nationwide prospective birth cohort analysis included 3137 women who delivered their first two live singletons between 2011 and 2014. The PPWR was defined as the body mass index (BMI) after 4 weeks of the first birth minus the pre-pregnancy BMI of the first pregnancy. LGA infants were compared among four PPWR groups: less than − 1 (a BMI loss of > 1 unit), − 1 to < 1 (the reference: stable PPWR group), 1 to < 3 (a BMI gain of 1–3 unit) and ≥ 3 (a BMI gain of > 3 unit). PPWR was assessed not only in all women but also in women with a BMI < 25 and ≥ 25 kg/m2, and adjusted odds ratios (ORs) were calculated for LGA infants by multiple logistic regression.

Results

The incidence of LGA infants was 8.8% (277 out of 3137). After adjusting for potential confounding factors, no association was observed between the risk of an LGA infant in the second pregnancy and the PPWR in all eligible women. Similarly, no association was observed between LGA risk in the second pregnancy and thePPWR in the pre-pregnancy BMI < 25 kg/m2 (normal) and ≥ 25 kg/m2 (overweight/obese) groups.

Conclusion

PPWR measured in the 4th-week post-delivery was not associated with an increased risk of LGA infants in the second pregnancy.