If children are short, second children are susceptible to autism.
the risk of autism in second children will increase if the time of the mother's second child is too short to be separated from the time of the first child.
US researchers investigated about 660 thousand babies, all of which were second children of the family, and more than 3100 of them were diagnosed with autism when the "old two" was 6 years old. The researchers found that if second children were born less than 1 years from the first child's birth, the risk of autism was two times higher than the usual level, and second children were about twice as likely to suffer from autism if they were born between 12 months and 23 months at birth; thereafter, the risk of autism was about twice as high as the normal level. This risk will decrease significantly with the prolongation of pregnancy interval.
researchers explained that there may be 3 reasons for this phenomenon: first, because the birth time is too close, the mother's physical strength can not be fully restored, the conditions for the uterus to give birth to second or third children are immature; two, the previous birth has depleted the folic acid, iron and other nutrients in the mother's body; three In a short time, pregnancy is associated with greater psychological stress. Previously, authoritative experts suggested that women should not give birth to their children again within two years after giving birth to a child, so as not to affect the health of the latter child.