In have always been killed more than boys, probably

 In some cultures there is a disdain for girls: abortions, neglect, abandonment and infanticide have been known to occur as a result. Historically, more girls have always been killed more than  boys, probably as a form of birth control to reduce the number of potential mothers (and the number of mouths to feed), as a well as for cultural reasons, and also eliminating the cost of a dowry.
The widespread prevalence  of female infanticide in India can be traced to the low regard for girls from Indian antiquity. The different treatment of boys and girls reflects the different expectations of what each would cost and contribute and provide for the family, therefore this outlooks contributes to female infanticide. In 1988 the Indian Association for Women’s Studies reported that 10,000 female foetuses are killed every year in India. 
The editorial of the national daily put the annual figure at 50,000 female foetuses (Times of India, August 6 1994). 
Yet another study determines that from 1978 to 1983, 73,000 female foetuses were reported killed, or 13,000 female foetuses were aborted after using amniocentesis as a sex determination test.  These conflicting statistics testify that brutality towards women  has become the undetectable, and surging,  crime against women. Furthermore, the approximate numbers indicate the size of a genocide.  Another indicator of the genocide is the declining sex ratio in India: in colonial India the gender imbalance demonstrated by the 1901 was 972:1000 (females per males). Following India’s independence the gender imbalance exacerbated rather than rectified with the 1981 census to 935:1000 (female: males). 
Moreover, 3 million women were missing under colonial rule, whereas this has increased to 22 million under independence.  India is distinctive and unique in that men outnumber women in its population, even though in the world over women outnumber men in population sizes, because the normal sex ratio favours the birth of baby girls. However, India has a steadily declining sex ratio which is skewed in favour of baby boys. 
The phenomenon and event of missing women is evidence that it is not just female foetuses which are endangered, but also the overall dire conditions which Indian women are forced to live in are life endangering.   “Intersectionality simply means that there are a lot of different parts to our womanhood.” – Brittney Cooper 
Diagram  Kimberle Crenshaw is credited with coining the term ‘intersectionality’. and  first used it in her 1989 paper ‘Demarginalising the Intersection of Race and Sex: Black Feminist Critique of Anti-discrimination Doctrine, Feminist Theory and Antiracist Politics’. 
Intersectionality centres around analysing and discussing how oppression often interacts, and then consequently results in unique experiences of discrimination, for example because of women’s social status in India resulting in Infanticide.
Intersectionality is gender based discrimination and oppression a woman may experience can be compounded by her race, socioeconomic status, sexual orientation and more.