Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Speech and Language Problems in Children ?
    ### Response:
    Children vary in their development of speech and language skills. Health professionals have milestones for what's normal. These milestones help determine if a child is on track or if he or she may need extra help. For example, a child usually has one or two words like "Hi," "dog," "Dada," or "Mama" by her first birthday.
    