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 In a child, one should be worried if and explain in detail?
.ge 2 months 3 months 6 months 9 months 12 months 15 months 18 months 2 years 3 years 4 years 5 years Milestone . . ( mile after being talked to) social smile s ther* anticipates feeds Recognizes mo * . t angers stranger anxiety Recognizes s r ' waves "bye bye" . h Called* plays simple ball game comes w en ' Jargon . Copies parents in task (~.g. sweeping) f food drink toilet; pulls people to Asks or * ' show toys Shares toys; knows full name and gender Plays cooperatively in a group; goes to toilet alone Helps in household tasks, dresses and undress