When there is crowding of the primary/baby teeth, that is often an indicator that a child may need braces. Other considerations are jaw sizes, discrepancies, narrow palate, habits (i.e., thumb sucking, etc.). So, there are times when it may be suggested that a 7-year-old see an orthodontist for an evaluation. Sometimes the orthodontist will simply monitor the child until the time is appropriate for braces. There are mixed ideas on whether orthodontics should be done in phases or when the adult dentition has fully erupted. Each patient is unique so there needs to be a decision that makes sense to both the patient/parent and the dentist/orthodontist. Second opinions are always a good idea. You, as the parent, need to be comfortable with the options.