There are more types and subtypes of nephritis, and common nephritis in babies include purpura fulminans, acute glomerulonephritis, nephrotic syndrome, etc. There are big differences between the clinical manifestations and pathologies of various kinds of nephritis, so it is recommended to make a clear diagnosis under the guidance of specialists. 1. Purpura nephritis: it is a disease caused by the involvement of the kidneys by allergic purpura. If the child has allergic purpura, renal damage occurs 2 to 4 weeks after the appearance of purpura, or delayed appearance, can be seen in hematuria, proteinuria or nephrotic syndrome and other clinical manifestations, suspected diagnosis of purpura nephritis. 2. Acute glomerulonephritis: referred to as acute nephritis, most often seen after streptococcal infection, the main clinical manifestations of hematuria, varying degrees of proteinuria, edema and hypertension, or renal insufficiency. It is mostly seen in children and adolescents, more boys than girls, and occurs mostly in 5-14 years old. 3. Nephrotic syndrome: it can be caused by infection, immunity, genetics and other etiological factors, with clinical manifestations of massive proteinuria, hypoalbuminemia, obvious edema and/or hyperlipidemia as clinical syndromes, of which the first two are the key to the diagnosis of this disease. There are more types and subtypes of nephritis. If your baby suspects nephritis, it is recommended that he/she should go to a regular hospital as early as possible for a clear diagnosis and treatment under the guidance of a doctor. Self-diagnosis is not recommended to avoid delaying the condition.