Urate Crystals In Baby's Diaper: Causes And Tips To Prevent Them

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Brick-red, pinkish stains in your newborn’s diaper may appear like bloody urine, but it is mostly due to urate crystals. Urate is a salt formed by uric acid, a weak organic acid produced in the body during the metabolism of certain endogenous products in the body(1). Urate crystals in the urine are often indicated by reddish, orange, or pinkish residue, almost appearing like red brick dust in the diaper.

It is normal to find urate crystals in your baby’s urine in the first few days following birth. However, prolonged excretion of urate crystals could be a concern. Read on to learn the causes of urate crystals in babies and the potential ways to prevent them.

What Causes Urate Crystals In An Infant’s Diaper?

A baby may excrete urate crystals due to the high concentration of uric acid in the blood. Uric acid is a waste product synthesize din the liver, intestines, and certain cells of the circulatory system when the body breaks down purines (2)(3). Purines are compounds formed during the natural processing of food compounds and compounds released due to natural cell death(4).

Uric acid enters the blood and reaches the kidneys. The kidneys filter uric acid, which dissolves with other compounds found in urine to form uric acid salts called urates. Excess uric acid leads to more urate formation. The excess urate is excreted through urine and visible as urate crystals in the baby’s diapers.

The following conditions and scenarios could lead to excess uric acid concentration (hyperuricemia) in the blood, leading to urate crystals in the baby’s diapers.

1. Dehydration

Breast milk is the only food for a newborn for the first six months of their lives. Babies get all their nutrition and fluids from breast milk. Inadequate ingestion of breast milk could increase the risk of dehydration, which may concentrate the urine, increasing the risk of urate crystals in the urine (5).

Breastfeeding issues, such as inadequate breast milk supply, are usually a leading reason for dehydration among babies. However, a baby may become dehydrated for several other reasons, such as vomiting due to illness and even prolonged nursing strikes. You may read more about the causes of dehydration in babies here.

2. Kidney diseases

Kidney diseases, such as chronic kidney disease (CKD), could affect the kidneys’ functions, making them less efficient at filtering blood. It could lead to the accumulation of urate crystals in the kidneys, causing kidney stones (6). Urate crystals from the kidneys may reach parts of the urinary tract and also pass through the urine.

Several types of kidney diseases exist, and babies may usually experience congenital kidney problems, such as those due to genetic disorders (7).CKD is usually the most common risk factor for hyperuricemia, excess uric acid in the blood, increasing the risk of urate crystals in baby’s diapers(8).

3. Underlying problems and other factors

Several other problems and conditions may lead to excess uric acid in blood and urate crystals in the urine. These conditions may usually be rare in infants(9).

  • Acidosis (excess acid in the blood)
  • Diabetes
  • Hypoparathyroidism
  • Chronic illnesses, such as leukemia
  • Maternal illnesses during pregnancy, such as preeclampsia
  • Side effects of certain medicines

Several factors may cause these conditions, and various factors may cause these conditions to lead to hyperuricemia. Therefore, do speak to the baby’s healthcare provider if you have any concerns about urate crystals due to illness in babies.

How Long Do Urate Crystals Last In Babies?

Studies suggest that about 22% of newborns show urate crystals in their diapers for the first one week of their life (10). Urate crystals in newborns usually resolve in days as the breast milk supply stabilizes and the baby feeds well.

If your baby has reddish residue of urate crystals in their diapers for more than a week, consult a doctor. You must also see a doctor if your baby is unwell or was diagnosed with a congenital problem at birth.

What Foods Can Cause Urate Crystals?

Uric acid is also produced due to the breakdown of purines found in food items (3). Urate crystals due to intake of excess purine-rich food items are not seen in babies younger than six months since they are exclusively breastfed.

The intake of excess purine-rich food items by babies older than six months may increase the risk of urate crystals. The following are food items with high purine content (11)(12).

  • Red meat
  • Organ meat, such as liver
  • Certain types of seafood, such as salmons, sardines, anchovies, shrimps, and lobsters
  • Dried beans
  • Foods and beverages rich in high fructose corn syrup

The occasional overeating of these foods seldom causes urate crystals in healthy babies. Urate crystals due to a high purine diet may occur if the baby’s solid food diet is consistently imbalanced for several weeks to months, causing other problems, such as malnutrition, as well.

Infants with existing kidney or liver problems and genetic disorders may be more likely to develop urate crystals due to purine-rich foods. An example is the Lesch-Nyhan syndrome, a rare genetic disorder that causes deficiency of an enzyme vital for processing purine. The absence of the enzyme affects the body’s biochemical pathways for processing purine. It leads to excess uric acid in the blood and increased chances of urate crystals due to a high purine diet(13).

How To Prevent Urate Crystals In Newborns?

Urate crystals during the first week of life are normal and seldom a cause for concern. Nevertheless, the following measures may help reduce the risk of the baby excreting urate crystals.

  • Ensure adequate breastfeeding. Make sure you breastfeed your baby soon after birth and keep breastfeeding on demand. According to the NHS, UK, you cannot overfeed a breastfed baby (14). Your baby will feed as much they need. Therefore, do not worry if they demand a feed several times across day and night. Adequate breastfeeding can prevent dehydration since breast milk is the only source of fluids for your little one for the first six months.
  • Provide the baby a well-balanced diet. Babies older than six months should be provided a diet containing food items in the right quantities. It will ensure they receive all nutrients and not just food items with excess purine. If your baby has Lesch-Nyhan syndrome or any other disorder requiring a special diet, consult a certified pediatric dietician.
  • Prevent factors that may cause dehydration. Dehydration may occur due to other factors, such as high humidity, high ambient temperature, and poor ventilation in the baby’s room. Babies tend to get overheated and dehydrated quickly (15). Therefore, it is essential to maintain the right room temperature in the baby’s room. You may read more about maintaining the right room temperature for babies here.

Finding urate crystals is quite common in baby diapers, especially in the first few days after birth. Most cases are benign and resolve within a week. If urate crystals persist beyond a week or your baby has other problems, discuss the treatment and management of that condition with the doctor. Ensuring adequate hydration through breastfeeding and a balanced diet could reduce the risk of urate crystals in most babies.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
  1. Justin Fender Monte S. Willis and Yuri Fedoriw Urine Crystals in a 1-Year-Old Male; Oxford Academic
  2. Rashika El Ridiaand HatemTallima Physiological functions and pathogenic potential of uric acid: A review; U.S. National Library of Medicine
  3. Uric Acid / Urate; NHS UK
  4. Uric Acid Test; U.S. National Library of Medicine
  5. Gout and Kidney Disease; National Kidney Foundation
  6. Uric Acid Stones; Cleveland Clinic
  7. Kidney Disease in Children; University of Rochester
  8. Ana Beatriz Vargas-Santos and TuhinaNeogi Management of Gout and Hyperuricemia in CKD; U.S. National Library of Medicine
  9. Uric acid – blood; U.S. National Library of Medicine
  10. Jack Y. Jengand Walter B. Franz
    Orange Stains in a Healthy Neonate’s Diaper; Sage Journals
  11. Which Foods are Safe for Gout?; Arthritis Foundation
  12. High Uric Acid Level; Cleveland Clinic
  13. LeschNyhan Syndrome; National Organization for Rare Disorders
  14. Your breastfeeding questions answered; NHS UK
  15. Babies and children in the heat; NSW Government
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Dr. Meenakshi Maruwada

Dr. Meenakshi is a dentist and a passionate writer with over eight years of experience in dentistry and four years in writing. She started her career as a dentist with a dental chain in Mumbai and soon rose to lead the clinic as a Head Dentist. She then switched to working for two start-ups in healthcare, before beginning her own... more