Feeding therapy is a specialty area of either speech therapy or occupational therapy. Feeding difficulties can sometimes show up as extreme picky eating, which can be either sensory or functional in nature. Kids can just not like the taste, texture, or other physical aspects of certain foods, or they can have difficulty actually chewing and swallowing certain foods safely.
Speech therapists have specialized training in treating dysphagia, a disorder of swallowing that can be related to difficulty chewing or difficulty with the complex muscle movements needed for safe swallowing and airway protection. Occupational therapists have specialized training in sensory processing and motor movements, and can help with self-feeding.
Feeding therapy can include food chaining to create a systematic bridge between accepted foods and target foods, sensory food play, and changing things about the eating environment to set your child up for success at mealtime!