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*'''Age of the parents:''' The minimum age for achievement of successful conception is described as twenty five for male and sixteen for female. Since both the partners are full of valour and vigor at this age, the born child also possesses these qualities. [Su. Sa. Sutra Sthana 35/13].  It is recommended that very young and very old women should not be impregnated. [Cha. Sa. [[Sharira Sthana]] 8/6]. The consequences of not following the recommended age of parents include intrauterine death of fetus, neonatal death, ill health and deformed body parts of  the child.[A. S. Sharira Sthana 1/5]
 
*'''Age of the parents:''' The minimum age for achievement of successful conception is described as twenty five for male and sixteen for female. Since both the partners are full of valour and vigor at this age, the born child also possesses these qualities. [Su. Sa. Sutra Sthana 35/13].  It is recommended that very young and very old women should not be impregnated. [Cha. Sa. [[Sharira Sthana]] 8/6]. The consequences of not following the recommended age of parents include intrauterine death of fetus, neonatal death, ill health and deformed body parts of  the child.[A. S. Sharira Sthana 1/5]
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Pregnancy in very young age causes premature births. Aneuploidy (abnormal chromosome number) is the principal hereditary abnormality associated with either parental age. Risk increases logarithmically with advancing parental age; at age 40, the risk is about 2%. In Down's syndrome, maternal age is a primary factor, but occasionally the father can be implicated.  
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Pregnancy in very young age causes premature births. Aneuploidy (abnormal chromosome number) is the principal hereditary abnormality associated with either parental age. Risk increases logarithmically with advancing parental age; at age 40, the risk is about 2%. In Down's syndrome, maternal age is a primary factor, but occasionally the father can be implicated.<ref>Congenital deformities and chromosomal disorders: maternal versus paternal age. Fertil Steril. 1977;28(8):888. doi:10.1016/s0015-0282(16)42748-2</ref>
    
*'''Day of sexual intercourse:'''  As per the menstrual cycle of the women, proliferative phase (rutukala) is considered as the most fertile period. During the bleeding phase of menstrual cycle, coitus is prohibited.  Acharya sushruta has explained the consequences of coitus in first three days of menstrual cycle as below.[Su. Sa .Sharira sthana 2/31]
 
*'''Day of sexual intercourse:'''  As per the menstrual cycle of the women, proliferative phase (rutukala) is considered as the most fertile period. During the bleeding phase of menstrual cycle, coitus is prohibited.  Acharya sushruta has explained the consequences of coitus in first three days of menstrual cycle as below.[Su. Sa .Sharira sthana 2/31]
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