The first way to determine indigestion in babies is as follows. For children with indigestion, there may be a heavy odor in the mouth, or a certain amount of bad breath. The appearance of dyspepsia is one of the most important early manifestations. The presence of foul odor in the mouth indicates that the child is suffering from digestive malfunction. Secondly, the tongue is heavy. Besides having bad breath, you need to see what kind of tongue the child has, if the tongue is clean, it means there is no problem with digestion. If the baby’s tongue is thick and yellow in color, then poor digestion should be considered. Thirdly, look at the sleep, children with better digestive function are better sleepers. Therefore, if the child sleeps poorly and cries at night, it is necessary to consider the possibility of poor digestion. Fourth, look at the child’s stool, if the number of stools is one to two times a day or once every two days, it is basically normal.