Season of birth is a good proxy for Vitamin D (for people far from the Equator)
Statistisically significant, but rarely greater than 20% change
Some health problems need Vitamin D in 2 or 3 trimesters, so are not associated with season
Perhaps some people in born in poor season will need more vitamin D all of their lives
Note: some of the season-of-birth effects are due to low vitamin D in future season as well
Some Season of Birth studies
- Season of birth associated with many health problem (UK Biobank) – Nov 2020
- Preterm birth varies with season: 25 percent more likely if conception in autumn – Feb 2022
- Little sun in first trimester, 2.9 X more likely to have learning disabilities – June 2019
- UV at time of conception associated with Vitamin D Receptor activation 65 years later – Sept 2017
- Autoimmune Addison's Disease – increased risk if born in Dec or Jan – Nov 2016
- Schizophrenia increased 40 percent for Spring births after Danes stopped vitamin D fortification – April 2014
- Season of birth associated with Pneumonia (10 %) and Multiple Sclerosis (30 %) – May 2013
- Majority of Season of Birth health problems should vanish if take Vitamin D
100K monthly, or 50K bi-weekly, or 4K daily
28 items in "Season of Birth" Category - Chart of Diseases correlated to month of birth – 2008
- Chart of Schizophrenia vs month of birth
- Chart of Age of Menarche and Height vs SoB - Biobank 2015
- See related in VitaminDWiki
- Fetus development vs month of gestation (Some portions need Vitamin D during all phases)
- Season of Birth primarily associated with Pregnancy, Multiple Sclerosis. and Cognitive categories
28 items in "Season of Birth" Category - wiki page:
- Health Problems Associated with Low Vitamin D at Birth
- Major reduction allergies and asthma if the child was born in a sunny season (in Paris in this case) – April 2024
- Season of birth associated with many health problem (UK Biobank) – Nov 2020
- More muscle strength 80 years after being born in warm season (no surprise) – Nov 2022
- Preterm birth varies with season: 25 percent more likely if conception in autumn – Feb 2022
- Summer births associated with 2X slower gross motor development at 6 months – May 2021
- October Babies more likely to be successful, live longer, etc (Vitamin D, etc) Oct 2019
- Little sun in first trimester, 2.9 X more likely to have learning disabilities – June 2019
- Conception in winter increases rate of Autism, learning disabilities, dyslexia – Oct 2016
- UV at time of conception associated with Vitamin D Receptor activation 65 years later – Sept 2017
- Gallstones 33 percent more likely if born during winter – Dec 2016
- Autoimmune Addison's Disease – increased risk if born in Dec or Jan – Nov 2016
- Season of Birth
- Season of birth (Vitamin D) vs birth weight, puberty, body size, etc. – Oct 2015
- Health problems are related to birth month - June 2015
- Anorexia nervosa and Vitamin D - several studies
- Schizophrenia increased 40 percent for Spring births after Danes stopped vitamin D fortification – April 2014
- Hypothesis- birth rate variation with season may trump MS variation with vitamin D – Jan 2014
- Season of birth associated with Pneumonia (10 %) and Multiple Sclerosis (30 %) – May 2013
- Multiple Sclerosis 23 percent more likely if born in April vs. Oct – meta-analysis Nov 2012
- Environmental risk factors for MS include latitude and vitamin D – Sept 2012
- Association between season of birth and suicide – perhaps vitamin D – Sept 2012
- 7 percent less likely to get immune mediated disease if born in the fall – July 2012
- Odds of living to 100 increase by 40 percent if had been born in the fall – 2011
- Diseases correlated to month of birth – 2008
- Is the variation in winter babies due to vitamin D – 2009
- Hypothesis: Low vitamin D linked to Myopia
Chart of Diseases correlated to month of birth – 2008
Chart of Schizophrenia vs month of birth
+Effects of Family History and Place and Season of Birth on the Risk of Schizophrenia
Feb 1999 DOI: 10.1056/NEJM199902253400803
Chart of Age of Menarche and Height vs SoB - Biobank 2015
Season of birth is associated with birth weight, pubertal timing, adult body size and educational attainment: a UK Biobank study
October 2015 DOI:https://doi.org/10.1016/j.heliyon.2015.e00031
Download the PDF from VitaminDWiki
See related in VitaminDWiki
- Overview Deficiency of vitamin D
- Children with Kawasaki disease are 29 X more likely to be Vitamin D deficient – Jan 2022
- Cancer during childhood - many studies
- Longevity and healthspan increased by Vitamin D, Omega-3, Magnesium - many studies
- Brain and Vitamin D - many studies
Fetus development vs month of gestation (Some portions need Vitamin D during all phases)
Details at Ensure a healthy pregnancy and baby - take Vitamin D before conception
Season of Birth primarily associated with Pregnancy, Multiple Sclerosis. and Cognitive categories
JavaScript disabledJavaScript is required for this search featureSummary of Associations
Associated category Associations Results
3 pages in both categories: Season of Birth + Breathing
14 pages in both categories: Season of Birth + Pregnancy
2 pages in both categories: Season of Birth + Cardiovascular
Page Hits Categories Major change Health Problems Associated with Low Vitamin D at Birth Breathing, Pregnancy, Cardiovascular, Rickets, Autism, Metabolic Syndrome, Season of Birth, ADHD 09 Aug, 2025 Health problems are related to birth month - June 2015 Pregnancy, Cardiovascular, Season of Birth 15 May, 2018 2 pages in both categories: Season of Birth + Autism
2 pages in both categories: Season of Birth + Meta-analysis of Vitamin D
3 pages in both categories: Season of Birth + Cognitive
4 pages in both categories: Season of Birth + Multiple Sclerosis
2 pages in both categories: Season of Birth + Top news
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