You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Low birth weight (LBW) is defined as a birth weight of less than ___ as per the World Health Organization (WHO) and explain in detail?
Ans. B 2.5 kg (Ref. The incidence of low birthweight, defined as the proportion of newborns weighing less than 2,500 grams, is monitored through both health system surveillance and household surveys. In 2013, nearly 22 million newborns--an estimated 16 per cent of all babies born globally that year--had low birthweight. Accurate monitoring is challenging, however, since nearly half of the world's infants are not weighed at birth.