Sources

Umbra is built on public-health guidance, peer-reviewed research, and the primary thesis of Recsetár-Maioli Kinga (ELTE PPK, 2026) on heatwave effects in the perinatal period [23]. Every tip and "did you know" carries a small [n] linking here. Sources 1–22 are the public-guideline baseline; sources 23–32 are the thesis layer, including the author's own Hungarian birth-statistics analysis (KSH 2010–2024) and country-specific projections.

1. [1]

   WHO 2021 — Heat & Health

   World Health Organization. Heat and Health (fact sheet & technical guidance), 2021.

   Open source ↗
2. [2]

   Chersich et al., BMJ 2020

   Chersich MF et al. Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis. BMJ 2020;371:m3811.

   Open source ↗
3. [3]

   NICE NG201 — Antenatal care

   NICE Guideline NG201: Antenatal care, 2021 (updated).

   Open source ↗
4. [4]

   NICE NG194 — Postnatal care

   NICE Guideline NG194: Postnatal care, 2021.

   Open source ↗
5. [5]

   RCOG — Exercise in pregnancy

   Royal College of Obstetricians and Gynaecologists. Physical activity and pregnancy, patient information.

   Open source ↗
6. [6]

   ACOG — Heat & exercise

   American College of Obstetricians and Gynecologists. Committee Opinion 804: Physical Activity and Exercise During Pregnancy and the Postpartum Period, 2020.

   Open source ↗
7. [7]

   Moretti et al. 2005 — Hyperthermia & NTDs

   Moretti ME et al. Maternal hyperthermia and the risk for neural tube defects in offspring: systematic review and meta-analysis. Epidemiology 2005;16(2):216–9.

8. [8]

   Zhang et al. — Heat & sperm

   Zhang MH et al. Effect of scrotal heating on testicular function and spermatogenesis: a review. Asian J Androl 2015;17(5):759–66.

9. [9]

   Basu et al. 2017 — Heat & stillbirth

   Basu R, Sarovar V, Malig BJ. Association between high ambient temperature and risk of stillbirth in California. Am J Epidemiol 2016;183(10):894–901.

10. [10]

    WHO — Infant feeding

    WHO. Exclusive breastfeeding for optimal growth, development and health of infants — no additional water needed in the first 6 months, including in hot climates.

    Open source ↗
11. [11]

    Almroth & Bidinger 1990

    Almroth S, Bidinger PD. No need for water supplementation for exclusively breast-fed infants under hot and arid conditions. Trans R Soc Trop Med Hyg 1990;84(4):602–4.

12. [12]

    NHS — Perineal care

    NHS. Looking after stitches and your perineum after birth (your body after the birth).

    Open source ↗
13. [13]

    RCOG — Perineal tears

    RCOG. Care of a third- or fourth-degree tear that occurred during childbirth, patient information.

    Open source ↗
14. [14]

    ABM Clinical Protocol #4 — Mastitis

    Academy of Breastfeeding Medicine. ABM Clinical Protocol #36: The Mastitis Spectrum, 2022.

15. [15]

    US Forest Service — Tree cooling

    US Forest Service / USDA. The net cooling effect of a young, healthy tree is equivalent to ten room-size air conditioners operating 20 hours a day.

    Open source ↗
16. [16]

    EPA — Heat island & cool roofs

    US EPA. Reducing Urban Heat Islands: Compendium of Strategies — trees and vegetation.

    Open source ↗
17. [17]

    CDC — Extreme heat tips

    CDC. Tips for preventing heat-related illness — cool wet cloth on neck, wrists and ankles.

    Open source ↗
18. [18]

    Lancet Countdown 2023

    Romanello M et al. The 2023 report of the Lancet Countdown on health and climate change. Lancet 2023;402:2346–94.

    Open source ↗
19. [19]

    Spain UNESCO siesta bid

    Spain has publicly proposed the siesta as a candidate for UNESCO Intangible Cultural Heritage as a traditional warm-climate adaptation. (Not yet inscribed.)

20. [20]

    Bonell et al. 2024 — Heat & pregnancy

    Bonell A et al. Effect of heat exposure during pregnancy on maternal and fetal health: scoping review. Environ Res 2024.

21. [21]

    WHO Euro 2021 — Heat-health action

    WHO Regional Office for Europe. Heat and health in the WHO European Region: updated evidence for effective prevention, 2021.

    Open source ↗
22. [22]

    Folate & UV

    Borradale D, Kimlin M. Vitamin D in pregnancy, sun exposure and the folate debate. Photochem Photobiol Sci 2012;11(12):1840–8.

23. [23]

    Recsetár-Maioli K., Thesis 2026

    Recsetár-Maioli Kinga. Meteorológiai hőhullámok és hőstressz hatásai a perinatális időszakban. Szakdolgozat, ELTE PPK Perinatális szaktanácsadó szakirányú továbbképzés, Budapest, 2026. (Témavezető: Csaba Judit.) N=505 anyai kérdőíves vizsgálat, Health Belief Model keretben.

24. [24]

    Climate Central 2025 — Pregnancy heat-risk days

    Climate Central. Pregnancy heat-risk days analysis, 2025. Magyarországon évente átlagosan 29, Budapesten 31 'terhességi hőkockázati nap'; a klímaváltozás legalább megduplázta ezek számát.

    Open source ↗
25. [25]

    KSH 2010–2024 — Napi élveszületések

    Központi Statisztikai Hivatal, Demográfiai évkönyv (2010–2024). A nyári napi születésszám átlagosan 4–8%-kal magasabb, mint az év többi részében (241 vs. 255/nap, p<0,001). Saját elemzés a szakdolgozatban.

    Open source ↗
26. [26]

    KlímAdat 2022

    KlímAdat projekt (OMSZ). 2071-től Magyarország egyes részein évi 197 napon is elérheti a hőmérséklet a 30°C-ot.

    Open source ↗
27. [27]

    Hu et al. 2025 — Prenatal heat & PPD

    Hu Y et al. Prenatal exposure to heat stress and postpartum depressive symptoms in the MADRES cohort. Environmental Research, 2025.

    Open source ↗
28. [28]

    Carrega et al. 2020 — Sleep & milk volume

    Carrega J et al. Impact of the quality of postpartum sleep and its health determinants on human milk volume. MCN 2020;45(5):289–295.

    Open source ↗
29. [29]

    Barreca et al. 2018 — Heat & conception

    Barreca A, Deschenes O, Guldi M. Maybe next month? Temperature shocks and dynamic adjustments in birth rates. Demography 2018;55(4):1269–1293. >27°C napok 8–10 hónappal később csökkentik a születésszámot.

    Open source ↗
30. [30]

    Ioannou et al. 2024 — Heatwave & sleep

    Ioannou LG et al. Impact of a simulated multiday heatwave on nocturnal physiology, behavior, and sleep. Appl Physiol Nutr Metab 2024;49(10):1394–1408. Már kis éjszakai testhő-emelkedés is jelentős alváscsökkenéssel jár.

    Open source ↗
31. [31]

    Bonell et al. 2022 — UmbiFlow & fetoplacental flow

    Bonell A et al. UmbiFlow™ feasibility study: heat stress and fetoplacental blood flow. Int J Gynecol Obstet 2022;158(1):157–163.

    Open source ↗
32. [32]

    Edney et al. 2022 — Heat & infant feeding

    Edney JM, Kovats S, Filippi V, Nakstad B. Systematic review of hot weather impacts on infant feeding practices in LMICs. Front Pediatr 2022;10:930348.

    Open source ↗
33. [33]

    WHO ANC 2016

    WHO Recommendations on Antenatal Care for a Positive Pregnancy Experience, 2016 — hydration, nutrition, rest, and counselling standards used in this app.

    Open source ↗
34. [34]

    WHO/UNICEF BFHI 2018

    WHO/UNICEF. Implementation guidance: Protecting, promoting and supporting breastfeeding (Baby-friendly Hospital Initiative), 2018 — exclusive breastfeeding 0–6 months, no extra water.

    Open source ↗
35. [35]

    WHO Labour Care 2018

    WHO Recommendations: Intrapartum care for a positive childbirth experience, 2018 — supportive care, hydration, temperature comfort in labour.

    Open source ↗
36. [36]

    WHO Hot weather & health workers

    WHO. Public health advice on preventing health effects of heat — guidance for the general public and health-care workers (updated). Recommends rebalancing electrolytes when fluid intake is high.

    Open source ↗

Have a source we should add or correct? Edit src/routes/sources.tsx.