"The census figures showing 914 girls per 1000 boys is the worst ever since independence. We have been demanding a change in the Pre-natal Diagnostic Techniques (PNDT) law since the last five years", Vyas told Hindustan Times.
The child sex ratio was 927 in the 2001 census.
PNDT law includes only the sonography test, which is not keeping pace with the advances in technology.
"The abysmal conviction rate law only proves the gaps and loopholes in the law in the present form", she said. Vyas also called for greater monitoring levels, raising awareness levels of the people at large, and reining in proactive involvement of religious and popular leaders.
"There is still a lot of stigma attached to the girl child. The states, especially the ones worst affected in terms of female foeticide, should also frame their own laws and monitor the mortality rate of girls", she said.
The NCW chairperson, however, expressed satisfaction in the overall increase in the country's sex ration to 940 women per thousand, and also the rise in female literacy levels.