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
Season of BirthPrinter Friendly Follow this page for updates31047 visitors, last modified 10 Aug, 2025, This page is in the following categories (# of items in each category)Attached files
ID Name Uploaded Size Downloads 18870 SoB Adult helght.jpg admin 26 Nov, 2022 33.43 Kb 631 18869 SoB menarch.jpg admin 26 Nov, 2022 34.73 Kb 617 18868 SoB Biobank 2015.pdf admin 26 Nov, 2022 290.35 Kb 457 18867 SoB Schizophrenia.jpg admin 26 Nov, 2022 29.29 Kb 669 14692 Season of birth vs longevity draft.pdf admin 10 Dec, 2020 481.31 Kb 552