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 Very low bih weight is less than:- and explain in detail?
Low bih weight (LBW)= Bih weight <2500g Very low bih weight (VLBW)= BW <1500g Extremely low bih weight (ELBW)= BW<1000g