Medical Conditions

Nephrotic Syndrome in Children

Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist

Content reviewed against published AAP, NIDDK, ASN guidelines

Editorial policy

Last reviewed: July 2026

If your baby has been diagnosed with or you suspect nephrotic syndrome in children, here is what the evidence says.

The short answer

Key takeaways

Nephrotic syndrome occurs when the kidneys leak large amounts of protein into the urine, leading to swelling (edema) around the eyes, feet, and belly. The most common type in children is minimal change disease, which responds to steroid treatment in about 90% of cases. While the condition often relapses, most children eventually outgrow it and retain normal kidney function long-term.
Usually normal when: Mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness
Call your doctor if: Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation
Varies by age — see the age-by-age breakdown below

“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”

— Fever and Your Child, American Academy of Pediatrics (AAP)

Parents everywhere have the same worry. You are doing the right thing by looking into it.

What Parents Should Know

According to AAP, NIDDK, ASN guidelines, nephrotic syndrome occurs when the kidneys leak large amounts of protein into the urine, leading to swelling (edema) around the eyes, feet, and belly. The most common type in children is minimal change disease, which responds to steroid treatment in about 90% of cases. While the condition often relapses, most children eventually outgrow it and retain normal kidney function long-term. At 0-12 months, nephrotic syndrome is rare in infants under 1 year. When it occurs in this age group, it is often called congenital or infantile nephrotic syndrome, which may be caused by genetic mutations (such as NPHS1 or NPHS2 genes). Congenital nephrotic syndrome is typically more resistant to steroid treatment than the childhood form and may require specialized management including albumin infusions, nutritional support, and sometimes kidney transplantation. It is generally considered normal when mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness. However, you should contact your pediatrician promptly if your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal

Worth Discussing

Mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness

Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation

Your child had a normal urinalysis at a recent checkup with no protein detected

Your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications

Occasional swelling of the feet or ankles after a long day of activity that resolves with rest

Your child has difficulty breathing or appears short of breath along with abdominal or body swelling, which may indicate significant fluid accumulation

Your child is eating, growing, and urinating normally

Your child has significantly decreased urine output or is producing very little urine despite drinking fluids

When to Seek Immediate Care

Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation
Your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications
Your child has difficulty breathing or appears short of breath along with abdominal or body swelling, which may indicate significant fluid accumulation
Your child has significantly decreased urine output or is producing very little urine despite drinking fluids

By Age

What to expect by age

0-12 months

Nephrotic syndrome is rare in infants under 1 year. When it occurs in this age group, it is often called congenital or infantile nephrotic syndrome, which may be caused by genetic mutations (such as NPHS1 or NPHS2 genes). Congenital nephrotic syndrome is typically more resistant to steroid treatment than the childhood form and may require specialized management including albumin infusions, nutritional support, and sometimes kidney transplantation.

1-5 years

This is the peak age for childhood nephrotic syndrome. Minimal change disease accounts for about 80-90% of cases in this age group. Parents typically notice puffy eyelids in the morning, swelling of the feet and ankles later in the day, and a swollen abdomen. The urine may appear foamy. Treatment with oral corticosteroids (prednisone/prednisolone) usually produces remission within 4 weeks. Relapses are common, occurring in about 60-80% of children.

5-12 years

Nephrotic syndrome can present or continue relapsing in school-age children. Children in this age group may notice that their clothes or shoes feel tight, or that their face looks puffy in the morning. A kidney biopsy may be recommended if the child does not respond to initial steroid therapy or if the presentation is atypical (such as persistent blood in the urine or elevated blood pressure). Steroid-sparing agents like cyclophosphamide, mycophenolate, or calcineurin inhibitors may be used for frequently relapsing cases.

12 years+

Adolescents with nephrotic syndrome are more likely to have forms other than minimal change disease, such as focal segmental glomerulosclerosis (FSGS). A kidney biopsy is more commonly performed in this age group. Medication adherence can be challenging in teenagers, and the psychosocial impact of steroid side effects (weight gain, mood changes, acne) should be discussed. Many children who had minimal change disease earlier will have outgrown their relapses by adolescence.

What to Tell Your Pediatrician

Describe when you first noticed nephrotic syndrome in children and how it has changed over time.
Note your baby's current age and which age-specific patterns you are seeing.
Mention if your child has persistent puffiness around the eyes, especially in the morning, that does not resolve by midday.
Mention if you notice swelling in your child's feet, ankles, or hands that seems to be worsening over days.
Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...

Mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness
Your child had a normal urinalysis at a recent checkup with no protein detected
Occasional swelling of the feet or ankles after a long day of activity that resolves with rest
Your child is eating, growing, and urinating normally

Mention at your next visit when...

Your child has persistent puffiness around the eyes, especially in the morning, that does not resolve by midday
You notice swelling in your child's feet, ankles, or hands that seems to be worsening over days
Your child's urine appears unusually foamy or bubbly
Your child has had nephrotic syndrome before and you notice early signs of relapse such as returning facial puffiness or decreased urine output

Act now when...

Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation
Your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications
Your child has difficulty breathing or appears short of breath along with abdominal or body swelling, which may indicate significant fluid accumulation
Your child has significantly decreased urine output or is producing very little urine despite drinking fluids

What You Can Do at Home

Keep track of when you notice nephrotic syndrome in children — noting the time of day, duration, and any triggers can help your pediatrician.
Remember that mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness — this is generally within the range of normal.
At 0-12 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
While monitoring at home, seek immediate care if your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation.

Baby Eye Swollen, Puffy, or Red

A swollen or puffy eye in a baby can have many causes, from mild (insect bite, allergic reaction, or normal morning puffiness) to serious (periorbital or orbital cellulitis). The key distinctions are whether the swelling involves just the eyelid or the area around the eye, whether there is fever, whether the eye itself is red or has discharge, and whether the swelling came on suddenly or gradually. Eye swelling with fever always needs prompt medical evaluation.

Preventing Dehydration in Babies During Hot Weather

Babies are more vulnerable to dehydration and heat-related illness because they have a higher metabolic rate and less efficient temperature regulation. For babies under 6 months, extra breast milk or formula feeds (not plain water) are the best way to maintain hydration in hot weather. Signs of dehydration include fewer than 4 wet diapers in 24 hours, dry mouth, no tears when crying, sunken fontanelle, and lethargy. Always keep babies out of direct sunlight and never leave them in a parked car.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is nephrotic syndrome in children normal?

When should I call the doctor about nephrotic syndrome in children?

Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation Your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications Your child has difficulty breathing or appears short of breath along with abdominal or body swelling, which may indicate significant fluid accumulation

When is nephrotic syndrome in children normal?

Mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness Your child had a normal urinalysis at a recent checkup with no protein detected Occasional swelling of the feet or ankles after a long day of activity that resolves with rest

What causes nephrotic syndrome in children?

Nephrotic syndrome occurs when the kidneys leak large amounts of protein into the urine, leading to swelling (edema) around the eyes, feet, and belly. The most common type in children is minimal change disease, which responds to steroid treatment in about 90% of cases. While the condition often relapses, most children eventually outgrow it and retain normal kidney function long-term. Common explanations include: Mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness. Your child had a normal urinalysis at a recent checkup with no protein detected.

What should I mention to my pediatrician about nephrotic syndrome in children?

You should mention nephrotic syndrome in children at your next visit if: Your child has persistent puffiness around the eyes, especially in the morning, that does not resolve by midday. You notice swelling in your child's feet, ankles, or hands that seems to be worsening over days. Your child's urine appears unusually foamy or bubbly.

Is nephrotic syndrome in children normal at 0-12 months?

Is nephrotic syndrome in children normal at 1-5 years?

Should I go to the ER for nephrotic syndrome in children?

Seek emergency care if your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation, or if your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications. When in doubt, call your pediatrician's after-hours line for guidance.

Does nephrotic syndrome in children go away on its own?

In many cases, nephrotic syndrome in children resolves on its own, especially when mild puffiness around the eyes in the morning that resolves quickly and is not associated with any other swelling or illness. By 12 years+, adolescents with nephrotic syndrome are more likely to have forms other than minimal change disease, such as focal segmental glomerulosclerosis (FSGS). A kidney biopsy is more commonly performed in this age group. Medication adherence can be challenging in teenagers, and the psychosocial impact of steroid side effects (weight gain, mood changes, acne) should be discussed. Many children who had minimal change disease earlier will have outgrown their relapses by adolescence.

AAP NIDDK ASN

References

[1]American Academy of Pediatrics. Nephrotic Syndrome in Children. HealthyChildren.org, 2023. AAP
[2]National Institute of Diabetes and Digestive and Kidney Diseases. Childhood Nephrotic Syndrome. NIH, 2024. NIDDK
[3]Noone DG, Iijima K, Parekh R. Idiopathic Nephrotic Syndrome in Children. Lancet, 2018. ASN

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss Nephrotic Syndrome in Children.

Things to mention

Describe when you first noticed nephrotic syndrome in children and how it has changed over time.
Note your baby's current age and which age-specific patterns you are seeing.
Mention if your child has persistent puffiness around the eyes, especially in the morning, that does not resolve by midday.
Mention if you notice swelling in your child's feet, ankles, or hands that seems to be worsening over days.
Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

Your child has persistent puffiness around the eyes, especially in the morning, that does not resolve by midday
You notice swelling in your child's feet, ankles, or hands that seems to be worsening over days
Your child's urine appears unusually foamy or bubbly

Urgent signs to report immediately

Your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation
Your child with known nephrotic syndrome develops fever, severe abdominal pain, or redness and warmth of the skin, which could indicate spontaneous bacterial peritonitis or cellulitis, both serious complications
Your child has difficulty breathing or appears short of breath along with abdominal or body swelling, which may indicate significant fluid accumulation

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

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Bottom line

Most cases of nephrotic syndrome in children are normal. Talk to your pediatrician if your child develops rapid and significant swelling of the face, abdomen, or extremities over hours to days, as this may indicate new-onset or relapsing nephrotic syndrome requiring urgent evaluation.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

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