In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?

Explanation

he sex of a child depends on the male parent but not on female parent. The sex of the baby has been decided at the time of fertilization itself. The chromosome pattern in human female is XX and that in the male is XY. Therefore all the haploid gamets produced by the female (ova) have the sex chromosome X, whereas the male gamets (sperms) have either X chromosome or Y chromosome. 50 percent of sperms carry the X chromosome while the other 50 percent carry the Y chromosome.
After fusion of the male and female gamets the zygote would carry either XX or XY depending on what type of sperm fertilised the ovum. The zygote carrying .XX. would develop into a female child and that with XY would form a male child. So, the sex of a child depends on the male parent (heterogametic parent) but not on mother.