When feeding formula to children must be brewed in accordance with the prescribed ratio, if not in accordance with the proportion of the main hazards include: 1, if the brewed water is too little, too high concentration, it is easy to lead to increased burden on the baby’s gastrointestinal tract, indigestion, causing diarrhea or difficult stool symptoms. 2, if too much water is added to the brew, resulting in too dilute concentration, it will make the nutrients of milk powder is insufficient, easily leading to 3. If the concentration of the brew is too high, the content of protein-based nutrients is too high, which will increase the burden on the baby’s kidneys. The concentration of the brew is too thick, but also easy to cause the baby intake of sodium ions, potassium ions concentration is too high, will affect the development of the nervous system, kidneys.