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Childhood nephrotic syndrome — the puffy-eyed toddler, the steroid response, relapses, and what parents can expect over the years.
Evidence reviewed & updated: 2026-08 — reflects the latest published trials and guidelines.
Nephrotic syndrome is the most common kidney disease of childhood — the classic presentation is a 2-6 year old with puffy eyes in the morning and swollen legs after a cold. Most have minimal change disease and respond beautifully to steroids, but relapses are common and the disease runs a years-long course. Parent knowledge is treatment: recognizing relapse early shortens every episode.
The picture is distinctive: swelling around the eyes (worse in the morning), puffy legs and feet, sometimes belly swelling — often appearing days after a viral infection. Urine tests show heavy protein; blood shows low albumin. In a 2-6 year old with this pattern, minimal change disease is so likely that steroids are often started without biopsy.
Parents become the surveillance system: home urine dipsticks detect protein relapse before visible swelling returns — the single most useful family skill.
Standard first course: prednisone for several weeks, then a taper. ~90% of children go into remission — proteinuria clears within 2-4 weeks. The hard parts are side effects (increased appetite, mood changes, sleep disruption — all temporary) and infections (steroids suppress immunity; live vaccines are deferred during treatment; pneumococcal and varicella vaccination matter).
Frequent relapsers (2+ within 6 months) or steroid-dependent children switch to steroid-sparing agents — mycophenolate, calcineurin inhibitors, or rituximab — to reduce steroid exposure while keeping remission.
Peritonitis is the feared one: fever plus abdominal pain in a nephrotic child is an emergency — fluid in the belly is a culture medium. Also: blood clots (the protein losses shift clotting balance) and 'nephrotic crisis' (infection collapsing fluid balance). The rules: fever or belly pain = same-day care; any swelling with breathing difficulty = emergency.
The long view is good: most children outgrow the relapsing pattern by adolescence, and long-term kidney function is typically normal.
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