*** Moved from IR1/CR1 Progress Reports to Bringing Family of USC to America forum, where topics about IR2 cases are discussed ***
That link is for applicants in the Dominican Republic. Based on OP's VJ profile, they will be interviewing in India. Each consulate has their own policy on whether toddler applicants are required to attend interview. At the consulate in my home country, all immigrant visa applicants, even toddlers, need to show up at the consulate for interview. Obviously, all questions are directed at their parent or adult guardian, but the children are required to be physically present regardless.
Best to contact your consulate directly to confirm if your child will be required to attend the interview. If so, you may request NVC to link your and your child's cases together so you two can be scheduled for interview together. Whether your child needs to attend the interview or not, DS-260 is required for your child. Police certificates are not required for applicants below 16 years old.