Medical Conditions

Signs of Lysosomal Storage Disease in Babies

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

Content reviewed against published NIH, AAP, Mayo Clinic guidelines

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If your baby has been diagnosed with or you suspect signs of lysosomal storage disease in babies, here is what the evidence says.

The short answer

Lysosomal storage diseases are a group of rare inherited conditions where the body lacks enzymes needed to break down certain substances, causing them to accumulate in cells. Signs may include developmental regression, enlarged liver or spleen, coarsening facial features, skeletal abnormalities, corneal clouding, and progressive neurological decline. Early diagnosis is important because some conditions now have enzyme replacement therapy or other treatments that can slow disease progression.

Key takeaways

  • Lysosomal storage diseases are a group of rare inherited conditions where the body lacks enzymes needed to break down certain substances, causing them to accumulate in cells. Signs may include developmental regression, enlarged liver or spleen, coarsening facial features, skeletal abnormalities, corneal clouding, and progressive neurological decline. Early diagnosis is important because some conditions now have enzyme replacement therapy or other treatments that can slow disease progression.
  • Usually normal when: Your baby is meeting developmental milestones and has not lost previously acquired skills
  • Call your doctor if: Your baby has rapid developmental regression with seizures or loss of vision
  • Varies by age — see the age-by-age breakdown below
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What Parents Should Know

According to NIH, AAP, Mayo Clinic guidelines, lysosomal storage diseases are a group of rare inherited conditions where the body lacks enzymes needed to break down certain substances, causing them to accumulate in cells. Signs may include developmental regression, enlarged liver or spleen, coarsening facial features, skeletal abnormalities, corneal clouding, and progressive neurological decline. Early diagnosis is important because some conditions now have enzyme replacement therapy or other treatments that can slow disease progression. At 0-3 months, most lysosomal storage diseases are not apparent at birth. Some newborn screening programs now include tests for certain storage diseases. If your baby's screening is abnormal for these conditions, prompt confirmatory testing and specialist referral are important. Some severe forms may present with hydrops fetalis (severe swelling) at birth. It is generally considered normal when your baby is meeting developmental milestones and has not lost previously acquired skills. However, you should contact your pediatrician promptly if your baby has rapid developmental regression with seizures or loss of vision.

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

Normal vs. Concerning

Usually Normal
Worth Discussing
Your baby is meeting developmental milestones and has not lost previously acquired skills
Your baby has rapid developmental regression with seizures or loss of vision
Your baby has a normal-sized liver and spleen
Your baby has severe hepatosplenomegaly with worsening symptoms
Your baby's newborn screening was normal
Your baby has unexplained liver or spleen enlargement

By Age

What to expect by age

0-3 months

Most lysosomal storage diseases are not apparent at birth. Some newborn screening programs now include tests for certain storage diseases. If your baby's screening is abnormal for these conditions, prompt confirmatory testing and specialist referral are important. Some severe forms may present with hydrops fetalis (severe swelling) at birth.

3-6 months

Early signs may be subtle: unexplained liver or spleen enlargement, persistent jaundice, or feeding difficulties. Some conditions present with an exaggerated startle response, vision problems, or cherry-red spots on the retina (seen during eye exam). If your pediatrician notices concerning findings, metabolic testing may be recommended.

6-12 months

Developmental regression (losing skills like sitting, reaching, or social smiling) is an important red flag. Some storage diseases cause progressive hypotonia, seizures, or vision loss. An ophthalmology exam and brain MRI may show characteristic findings. A metabolic genetics specialist can guide enzyme testing.

12-24 months

Progressive symptoms become more apparent: regression of motor and cognitive skills, worsening of hepatosplenomegaly, skeletal changes, or hearing loss. For conditions with available enzyme replacement therapy (like Gaucher, Fabry, or some mucopolysaccharidoses), early diagnosis and treatment can significantly improve outcomes.

2-3 years

Some milder forms of storage diseases present later with progressive clumsiness, learning difficulties, behavioral changes, or progressive skeletal abnormalities. A high index of suspicion and appropriate enzyme and genetic testing lead to diagnosis. Gene therapy is an emerging treatment option for some conditions.

What to Tell Your Pediatrician

  • Describe when you first noticed signs of lysosomal storage disease in babies and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your baby has unexplained liver or spleen enlargement.
  • Mention if your baby appears to be losing developmental skills they previously had.
  • 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...
  • Your baby is meeting developmental milestones and has not lost previously acquired skills
  • Your baby has a normal-sized liver and spleen
  • Your baby's newborn screening was normal
Mention at your next visit when...
  • Your baby has unexplained liver or spleen enlargement
  • Your baby appears to be losing developmental skills they previously had
  • You have a family history of storage diseases or unexplained childhood neurological decline
Act now when...
  • Your baby has rapid developmental regression with seizures or loss of vision
  • Your baby has severe hepatosplenomegaly with worsening symptoms

What You Can Do at Home

  • Keep track of when you notice signs of lysosomal storage disease in babies — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that your baby is meeting developmental milestones and has not lost previously acquired skills — this is generally within the range of normal.
  • At 0-3 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 baby has rapid developmental regression with seizures or loss of vision.

Signs of a Metabolic Disorder in Babies

Metabolic disorders (inborn errors of metabolism) occur when the body cannot properly process certain nutrients or chemicals. Many are detected through newborn screening. Signs can include poor feeding, vomiting, lethargy, seizures, unusual body or urine odor, failure to thrive, developmental regression, and metabolic crises triggered by illness or fasting. Early detection and treatment are crucial, as many metabolic disorders are manageable with dietary modifications and medical treatment.

Signs of Mitochondrial Disease in Babies

Mitochondrial diseases affect the body's ability to produce energy at the cellular level and can affect virtually any organ system. Signs in babies include low muscle tone, poor growth, developmental delays or regression, seizures, vision or hearing loss, exercise intolerance, and multi-organ involvement (brain, muscles, heart, liver). These conditions are rare but important to consider when a baby has progressive symptoms affecting multiple organ systems. Diagnosis requires specialized testing.

When Is Genetic Testing Recommended for a Baby?

Genetic testing may be recommended when a baby has multiple birth defects, developmental delays without clear cause, dysmorphic features, a family history of genetic conditions, abnormal newborn screening results, or when a specific genetic condition is suspected. Types of testing include chromosomal microarray, whole exome sequencing, and targeted gene panels. Results can guide treatment, predict outcomes, and inform family planning.

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 signs of lysosomal storage disease in babies normal?
Lysosomal storage diseases are a group of rare inherited conditions where the body lacks enzymes needed to break down certain substances, causing them to accumulate in cells. Signs may include developmental regression, enlarged liver or spleen, coarsening facial features, skeletal abnormalities, corneal clouding, and progressive neurological decline. Early diagnosis is important because some conditions now have enzyme replacement therapy or other treatments that can slow disease progression.
When should I call the doctor about signs of lysosomal storage disease in babies?
Your baby has rapid developmental regression with seizures or loss of vision Your baby has severe hepatosplenomegaly with worsening symptoms
When is signs of lysosomal storage disease in babies normal?
Your baby is meeting developmental milestones and has not lost previously acquired skills Your baby has a normal-sized liver and spleen Your baby's newborn screening was normal
What causes signs of lysosomal storage disease in babies?
Lysosomal storage diseases are a group of rare inherited conditions where the body lacks enzymes needed to break down certain substances, causing them to accumulate in cells. Signs may include developmental regression, enlarged liver or spleen, coarsening facial features, skeletal abnormalities, corneal clouding, and progressive neurological decline. Early diagnosis is important because some conditions now have enzyme replacement therapy or other treatments that can slow disease progression. Common explanations include: Your baby is meeting developmental milestones and has not lost previously acquired skills. Your baby has a normal-sized liver and spleen.
What should I mention to my pediatrician about signs of lysosomal storage disease in babies?
You should mention signs of lysosomal storage disease in babies at your next visit if: Your baby has unexplained liver or spleen enlargement. Your baby appears to be losing developmental skills they previously had. You have a family history of storage diseases or unexplained childhood neurological decline.
Is signs of lysosomal storage disease in babies normal at 0-3 months?
Most lysosomal storage diseases are not apparent at birth. Some newborn screening programs now include tests for certain storage diseases. If your baby's screening is abnormal for these conditions, prompt confirmatory testing and specialist referral are important. Some severe forms may present with hydrops fetalis (severe swelling) at birth.
Is signs of lysosomal storage disease in babies normal at 3-6 months?
Early signs may be subtle: unexplained liver or spleen enlargement, persistent jaundice, or feeding difficulties. Some conditions present with an exaggerated startle response, vision problems, or cherry-red spots on the retina (seen during eye exam). If your pediatrician notices concerning findings, metabolic testing may be recommended.
Should I go to the ER for signs of lysosomal storage disease in babies?
Seek emergency care if your baby has rapid developmental regression with seizures or loss of vision, or if your baby has severe hepatosplenomegaly with worsening symptoms. When in doubt, call your pediatrician's after-hours line for guidance.
Does signs of lysosomal storage disease in babies go away on its own?
In many cases, signs of lysosomal storage disease in babies resolves on its own, especially when your baby is meeting developmental milestones and has not lost previously acquired skills. By 2-3 years, some milder forms of storage diseases present later with progressive clumsiness, learning difficulties, behavioral changes, or progressive skeletal abnormalities. A high index of suspicion and appropriate enzyme and genetic testing lead to diagnosis. Gene therapy is an emerging treatment option for some conditions.
NIHAAPMAYO CLINIC

References

  1. [1]National Institute of Neurological Disorders and Stroke. Lysosomal Storage Diseases. NIH
  2. [2]American Academy of Pediatrics. Newborn Screening for Lysosomal Storage Disorders. Pediatrics. AAP
  3. [3]Mayo Clinic. Gaucher disease and other storage diseases. Mayo Clinic

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss Signs of Lysosomal Storage Disease in Babies.

Things to mention

  • Describe when you first noticed signs of lysosomal storage disease in babies and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if your baby has unexplained liver or spleen enlargement.
  • Mention if your baby appears to be losing developmental skills they previously had.
  • 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 baby has unexplained liver or spleen enlargement
  • Your baby appears to be losing developmental skills they previously had
  • You have a family history of storage diseases or unexplained childhood neurological decline

Urgent signs to report immediately

  • Your baby has rapid developmental regression with seizures or loss of vision
  • Your baby has severe hepatosplenomegaly with worsening symptoms

My notes

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

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

2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members

Related Resources

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Bottom line

Most cases of signs of lysosomal storage disease in babies are normal. Talk to your pediatrician if your baby has rapid developmental regression with seizures or loss of vision.

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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Signs of a Metabolic Disorder in Babies

Metabolic disorders (inborn errors of metabolism) occur when the body cannot properly process certain nutrients or chemicals. Many are detected through newborn screening. Signs can include poor feeding, vomiting, lethargy, seizures, unusual body or urine odor, failure to thrive, developmental regression, and metabolic crises triggered by illness or fasting. Early detection and treatment are crucial, as many metabolic disorders are manageable with dietary modifications and medical treatment.

Signs of Mitochondrial Disease in Babies

Mitochondrial diseases affect the body's ability to produce energy at the cellular level and can affect virtually any organ system. Signs in babies include low muscle tone, poor growth, developmental delays or regression, seizures, vision or hearing loss, exercise intolerance, and multi-organ involvement (brain, muscles, heart, liver). These conditions are rare but important to consider when a baby has progressive symptoms affecting multiple organ systems. Diagnosis requires specialized testing.

When Is Genetic Testing Recommended for a Baby?

Genetic testing may be recommended when a baby has multiple birth defects, developmental delays without clear cause, dysmorphic features, a family history of genetic conditions, abnormal newborn screening results, or when a specific genetic condition is suspected. Types of testing include chromosomal microarray, whole exome sequencing, and targeted gene panels. Results can guide treatment, predict outcomes, and inform family planning.

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