High temperature are easy to create man and baby do?

Past studies found early, gender, date of birth of small mice and bats, and ambient temperature are quite closely related.

In order to find out the relationship between gender and environment temperature of human babies, Germany researchers are tracking birth records for 1946-1995, and against local temperature changes. Found April to June is on the ground of male babies born up to the month, October is month of the male babies were born at least.

Further analysis showed that eggs one month before the combined environment of temperature, that is, male and female in sexual behavior occurred a month before the temperature of the environment, is an important factor influencing baby gender. High-temperature environment easy to create man and baby, low temperature environment easy to create a female baby.

Further reading: boy or girl boy or woman want affected by the temperature thermometers can help

Temperature can affect the baby gender, the researchers hypothesis is: high temperature will affect the x chromosome of the sperm, let the baby is born is not easy; low temperature affects the y chromosome of the sperm, so that male babies born is not easy.

Another hypothesis is: temperature is high, the stronger the desire of having sex. High-temperature environment will stimulate the increase of frequency of sex between men and women, making women more likely to conceive.

Other research is that, with the y chromosome of the sperm, and swim faster, but with an x chromosome of the sperm, less brittle. So frequent sex situations, easier to with the y chromosome of the sperm and the egg, give birth to male babies. But in sexuality under reducing conditions, more likely to wait with the x chromosome of the sperm and the egg of opportunities, more likely to give birth to female babies.

Researchers are more worried about is, under the increasing global temperature increase of the greenhouse effect, chances of male babies born are getting higher and higher, can cause imbalance in the ratio of men and women.