Her daughter Hanna arrived on November 11, Brother Eric arrived on February 2, — 84 days later. The eggs were fertilised by dad Simon through IVF, then frozen. The surrogate mum gave birth to Bailey in Megan was born on May 21, By Sarah Arnold. Please see our Privacy Notice for details of your data protection rights.
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9. Lightest Baby Born
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What is the Most Popular Birth Month? - UnityPoint Health
Police Man charged over death of schoolboy, 11, whose body was found in house Brooklyn Colbert had multiple injuries at a house near Ballynanty, Limerick, on Sunday night. Robert B. Barlow Jr. This study is the most exhaustive, careful study to show that what applies to animals in general is also true for us.
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But the researchers have also discovered that the influence of the seasons has flagged considerably with the advent of industralization, as ever more people spend most of their time under artificial light and kept artificially heated or cooled. They say the changes may partly explain rising infertility rates in Western nations, as well as other hormonal problems linked to the endocrine system. The impact of the elements is going down the drain. In the new study, the scientists scrutinized birth records of countries, representing tens of millions of births.
Studying the United States and Europe and the other countries of the temperate zone in the Northern Hemisphere the researchers found there are two annual conception peaks, which continue today but were especially notable before the era of extensive industrialization. One statistical spike occurs around the spring equinox, in March, resulting in a spate of births in late December or early January.
The second arrives in autumn, around October or November, leading to a slight glut of babies arriving in mid-summer. The conception peaks blur slightly in one direction or the other, depending on weather conditions of a particular region. For example, in the United States spring is colder than it is in Europe, and so the first conception peak here occurs somewhat after the vernal equinox, when the temperature is becoming a bit balmier. But in Europe, where the later fall is often chilly and drizzly, the second reproductive peak is earlier than in the United States, corresponding more closely to the autumnal equinox, in September.
The ideal conception day, said Dr. Roenneberg, is ''the sort of day in spring or autumn when you have nice nights and days that are agreeable and warm. What we can know for sure is that even though it appears humans may have a quasi-mating season, it is not really a true one as women are receptive to sex year-round and ovulate every 28 days , not annually.
Unlike other animals, humans have concealed ovulation because they don't show any outward sign of biological fertility, which is still a mystery to scientists. To create the heat map above, we filtered the latest UN data on live births by month to obtain figures between and which is the time period with the greatest amount of data for all countries listed. In order to account for differences in the number of days in each calendar month, we then calculated the average number of live births per day in each month and ranked every month of the year relative to each other.
For example, for the United States, the average number of live births per day for each month was calculated.
Each month was then ranked relative to each other in terms of the average number of live births per day, from highest to lowest. Since the month of September registered the greatest average number of births per day for this time period, it was assigned a ranking of 1; August exhibited the second highest total, and so received a ranking of 2; and so on.
The heat map was then created using a color scale corresponding to the rank value of each month, from 1 to This way, the color-coded visualization would allow for easy comparisons across countries and hemispheres. Otherwise, the vast disparities between live birth numbers from one country to another would generate a color scale too broad in scope that would not allow for quick visual comparisons by viewers.
What are your thoughts on these conception and birth trends? Do you think other external factors besides climate and season are involved? Let me know in the comments section below! Fascinating and definitely fun!
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Otherwise I love it! Thanks for your thoughtful analysis and visualization. Thanks for the feedback! Overall trend is more or less the same. This is a personal observation — I have been collecting examples in the last several years but for a statistical study one would need access to big data of both births and family relations. Could it be that some genotypes favor their own mating season?
brocasanabid.cf Is this related to culture and social relations? Just currious…. Interesting hypothesis, Anastas. Have you published something on this topic yet? No, my studies are in a totally different field. This is just an observation without a statistical backing. I pay attention to this fact whenever I see another confirmation but it may be also a classic case of confirmation bias :.
That is why I am wondering which public source I can tap into for the relevant data. UK is September; people want their kids to be older when they start school because they get an advantage by a few more months development prior to first attending. This is a problem when you miss the September date by one day and become the youngest, and thus most disadvantaged.
Lots of social factors play into this. India is the second most populous country and largest diversified country. This is an interesting study. The study can be flipped around to give an insight on the possibility of the time people are having sex most.
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The seasons and festival in the countries can possibly offer additional information.