The association between birth weight, season of birth and latitude

McGrath, John J.; Barnett, Adrian; Eyles, Darryl W.

doi:10.1080/03014460500154699

Cited by 50 publications

(32 citation statements)

References 25 publications

(31 reference statements)

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“…In contrast, supplemental vitamin D (1,200 IU/ day with 375 mg Ca/day or a single large dose of 600,000 IU in the last trimester) in Indian women increases birthweight 6% and 12%, respectively, in a nonplacebo-controlled RCT (86). Furthermore, an inverse relationship of maternal 25OHD with birthweight is reported in four observational studies (75,89,119,137). Birthweight Z score inversely correlates with maternal postpartum 25OHD level (137).…”

Section: Discussionmentioning

confidence: 77%

Vitamin D in Pregnancy and Lactation in Humans

2011

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Concerns exist about the adequacy of vitamin D in pregnant and lactating women. This review assesses the evidence that maternal vitamin D status influences maternal, fetal, and breast-fed infant bone health; maternal adverse outcomes (preeclampsia, gestational diabetes, obstructed labor, and infectious disease); fetal adverse outcomes (growth, gestational age, and developmental programming); and infant adverse outcomes. The evidence for all of these outcomes is contradictory (except for maternal infectious disease) and lacking causality; thus, it is inconclusive. The 2011 Dietary Reference Intakes for vitamin D and their implications for assessing vitamin D status are discussed. An estimated 5% to 29% of American pregnant women may have inadequate vitamin D status, with the higher prevalence in African Americans. Little is known about the prevalence of inadequacy in American lactating women. Research needs are also identified, especially the need for rigorous and well-designed randomized clinical trials to determine the role of vitamin D in nonbone health outcomes in pregnancy and lactation.

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Section: Discussionmentioning

confidence: 77%

Vitamin D in Pregnancy and Lactation in Humans

2011

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“…This influence concerns many biological features, among others: fecundity, conceptions and births (Leslie and Fry, 1989;Lam et al, 1994;Malina and Himes, 1977;Panter-Brick, 1996), sex ratio at birth (Nonaka et al, 1999), children's birth parameters (McGrath et al, 2005), infant mortality (Doblhammer and Vaupel, 2001), adult mortality (Moore et al, 1997), height and weight in later life (Banegas et al, 2001;Henneberg and Louw, 1993;Kościński et al, 2004;Krenz-Niedbała et al, 2011;Shephard et al, 1979;Weber et al, 1998), cardiovascular conditions in adulthood (Doblhammer and Vaupel, 2001;Painter et al, 2005), life expectancy and the probability of death at older ages (Doblhammer and Vaupel, 2001;Gagnon, 2012;Muñoz-Tudurí and García-Moro, 2008), and even the incidence of certain neurodegenerative diseases, such as multiple sclerosis (Doblhammer et al, 2005; G Model JCHB-25372; No. of Pages 13 Salzer et al, 2010;Wiberg and Templer, 1994;Willer et al, 2005) or Parkinson's disease (Gardener et al, 2010;Mattock et al, 1988).…”

Section: Discussionmentioning

confidence: 98%

Prenatal factors associated with the neonatal line thickness in human deciduous incisors

Kurek

Żądzińska

Sitek

et al. 2015

HOMO

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“…Weber found that height at age 18 is dependent on month of birth using an Austrian male cohort and postulated that melatonin may play a role in growth [35]. Another hypothesis is that the effect of sunshine on vitamin D levels may affect fetal growth [34] and risk of preterm delivery [38]. A previous study in Sarlahi, Nepal, found the lowest levels of Vitamin D deficiency in June through August (4.3% prevalence) [23], supporting a hypothesis that 1st trimester exposure to sunlight (low Vitamin D deficiency) is correlated with high weights at birth (March through May).…”

Section: Discussionmentioning

confidence: 99%

Seasonality of birth outcomes in rural Sarlahi District, Nepal: a population-based prospective cohort

Hughes

Katz

Mullany

et al. 2014

BMC Pregnancy Childbirth

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BackgroundWhile seasonality of birth outcomes has been documented in a variety of settings, data from rural South Asia are lacking. We report a descriptive study of the seasonality of prematurity, low birth weight, small for gestational age, neonatal deaths, and stillbirths in the plains of Nepal.MethodsUsing data collected prospectively during a randomized controlled trial of neonatal skin and umbilical cord cleansing with chlorhexidine, we analyzed a cohort of 23,662 babies born between September 2002 and January 2006. Project workers collected data on birth outcomes at the infant’s household. Supplemental data from other studies conducted at the same field site are presented to provide context. 95% confidence intervals were constructed around monthly estimates to examine statistical significance of findings.ResultsMonth of birth was associated with higher risk for adverse outcomes (neonatal mortality, low birthweight, preterm, and small for gestational age), even when controlling for maternal characteristics. Infants had 87% (95% CI: 27 – 176%) increased risk of neonatal mortality when born in August, the high point, versus March, the low point.ConclusionSeasonality of neonatal deaths, stillbirths, birth weight, gestational age, and small for gestational age were found in Nepal. Maternal factors, meteorological conditions, infectious diseases, and nutritional status may be associated with these adverse birth outcomes. Further research is needed to understand the causal mechanisms that explain the seasonality of adverse birth outcomes.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2393-14-310) contains supplementary material, which is available to authorized users.

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The association between birth weight, season of birth and latitude

Cited by 50 publications

References 25 publications

Vitamin D in Pregnancy and Lactation in Humans

Vitamin D in Pregnancy and Lactation in Humans

Prenatal factors associated with the neonatal line thickness in human deciduous incisors

Seasonality of birth outcomes in rural Sarlahi District, Nepal: a population-based prospective cohort

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