Baby diarrhea dehydration is generally categorized into hypotonic dehydration, hypertonic dehydration and isotonic dehydration, different nature of dehydration performance symptoms are different. For example, hypotonic dehydration will appear fatigue and dizziness, nausea and vomiting, confusion, dyspnea and other symptoms. 1. Hypotonic dehydration: when the blood sodium concentration is below 135mmol/L, children will have symptoms of fatigue, dizziness, numbness of hands and feet; when the blood sodium concentration is below 130mmol/L, nausea and vomiting, fainting and other symptoms will occur; when the blood sodium concentration is below 120mmol/L, confusion, spasmodic twitching of the muscles, respiratory distress, shock and other symptoms will occur. 2. Hypertonic dehydration: if the water loss reaches 2%-3% of body weight, the child will have increased urine specific gravity and decreased urine output; if the water loss reaches 4%-6% of body weight, the child will have severe thirst, accelerated heart rate, dry skin, dizziness, irritability, etc.; if the water loss reaches 7%-14% of body weight, the child will have disorientation, fainting, dehydrated fever and other manifestations. 3. Isotonic dehydration: the main clinical symptoms of children with oliguria, nausea, fatigue, anorexia, etc., some children will be accompanied by dry tongue, dry skin, flaccid and other signs. If the baby diarrhea symptoms of dehydration, parents should take the baby to the hospital in a timely manner, under the guidance of the doctor for treatment, to avoid untimely treatment and cause more serious diseases.