An 18-month-old boy is seen by a speech pathologist for a speech and language evaluation. During the initial interview, the parents report that the boy started taking spoon feedings at 15 months of age; he frequently gags, especially on new textures; he easily becomes lethargic during feedings; and his feeding periods last longer than 50 minutes. The parents have also noticed that the boy has not gained any significant weight during the past 2 months. On the basis of this information, what should the SLP do