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 This milestone is achieved by a child at age of __________ and explain in detail?
Follows moving object (180degrees) develops at 2 months Also at 2 months Smiles on social contact Listens to voice and coos Head sustained in a plane of the body on ventral suspension Ref : Nelson 20th edition pg no : 66