Causes

• Main cause: Sore mouth or throat. See MOUTH ULCERS or SORE THROAT after using this topic to check for dehydration.
• Common cause in infants: Blocked nose in bottle or breastfed infant (Reason: can't breathe while sucking). See COLDS after using this topic.
• Common cause: Nausea from viral stomach infection without vomiting.
• Difficulty breathing with bronchiolitis or croup. (Reason: not enough energy to both suck and breathe)