I appreciate your concern. In an 11 month old, frequent stools can be increased gastrocolic reflex in children BUT the hard motion as you noticed points to constipation and interval diarrhoea. I would first ask the mother if the child is bottle fed or breastfed / In bottlefed babies these unpleasant side effects are seen and I would ask to stop bottle immediately and feed from a cup or glass or a baby sipper and avoid bottle nipple. Most importantly I would rule out hypothyroidism as a cause for constipation by a simple TSH test. If normal I would recommend more water and fiber containing homemade food. If there is no relief, a safe Lactulose ( Complex carbohydrate-,a synthetic sugar with laxative properties. It is a disaccharide consisting of glucose and fructose units. ) syrup will be given And for excoriations in anal area an antibiotic cream , avoid diapers and keep the area dry and airy by leaving open or loose cotton cloth covering. Hope this clarifies your concerns and you are free to ask me any further doubts. Regards