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Primipaternities and human birthweights.

Pierre-Yves Robillard1, Gustaaf Dekker2, Gérard Chaouat3

  • 1Service de Néonatologie. Centre Hospitalier Universitaire Sud Réunion, BP 350, 97448 Saint-Pierre Cedex, La Réunion, France; Centre d'Etudes Périnatales Océan Indien (CEPOI). Centre Hospitalier Universitaire Sud Réunion, BP 350, 97448, Saint-Pierre cedex, La Réunion, France.

Journal of Reproductive Immunology
|August 31, 2021
PubMed
Summary
This summary is machine-generated.

New fatherhood in multiparous pregnancies is linked to lower birthweights. This suggests a "couple habituation" to paternal genes may influence fetal growth, impacting newborn weight.

Keywords:
BirthweightEpidemiologyMultiparityPreeclampsiaPrimiparityPrimipaternity

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Area of Science:

  • Reproductive Medicine
  • Maternal-Fetal Medicine
  • Perinatal Epidemiology

Background:

  • Birthweight is a critical indicator of neonatal health.
  • Previous studies indicate primiparity is associated with lower birthweights.
  • The impact of a new paternal partner in subsequent pregnancies is less understood.

Purpose of the Study:

  • To examine the association between primipaternity (a new father for the index pregnancy) and newborn birthweights in multiparous women.
  • To investigate the relationship between primipaternity and the risk of intrauterine growth restriction (IUGR).

Main Methods:

  • An observational cohort study conducted over 20 years (2001-2020) at a French overseas department maternity unit.
  • Comparison of 811 multiparous women with a new partner (cases) against 49,712 women without a new partner (controls).
  • Statistical analysis controlled for confounding factors including maternal age, preeclampsia, smoking, and alcohol consumption.

Main Results:

  • Primipaternity was identified as an independent risk factor for small for gestational age (SGA) newborns (OR 1.48, p<0.001).
  • Women with a new partner had a significantly higher risk of preeclampsia (OR 3.94, p<0.001), particularly early-onset preeclampsia.
  • Cases exhibited higher rates of assisted reproductive technology use and were more likely to smoke and consume alcohol during pregnancy.

Conclusions:

  • Primipaternity is associated with an increased risk of delivering small for gestational age infants in multiparous women.
  • The findings suggest a potential biological mechanism, termed 'couple habituation,' where fetal growth may be influenced by the duration of the couple's genetic interaction.
  • Further research is warranted to elucidate the mechanisms underlying the observed association between primipaternity and birth outcomes.