Crystal Urine in Infants: Causes and Solutions - Pediatrics

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Crystalline urine in a five-month-old infant?


Hello, doctor! My son has been experiencing crystalluria intermittently since he was four months old.
Since he sleeps through the night, he does not have any nighttime feedings.
However, every morning when I open his diaper, the first urine is a deep orange color.
Sometimes, even in the afternoon, his urine remains very dark! We have taken him to the hospital for urine tests, and everything came back normal.
The doctor advised increasing his fluid intake, but my son is exclusively breastfed, having four meals a day with 210 ml each.
To be honest, he doesn't consume much water or solid foods! Since my son has had a urinary tract infection in the past, could the ongoing crystalluria affect his kidneys or bladder? Could it potentially lead to another urinary tract infection? Is there a solution to this issue? Thank you, doctor!

Liao Baba, 30~39 year old female. Ask Date: 2016/05/24

Dr. Pei Rensheng reply Pediatrics


Hello: Crystalluria indicates concentrated urine.
Urinalysis has been performed to rule out infection.
Additionally, urinary tract infections are likely to cause fever.
With summer approaching, fluid loss through the skin and respiratory tract increases, so the solution is to consume more water-rich foods.
Wishing you safety and health.
Sincerely, Dr.
Pei Ren-sheng, Chief of Pediatrics, Taoyuan General Hospital, Ministry of Health and Welfare.

Reply Date: 2016/05/24

More Info


Understanding crystal urine in infants can be a concerning issue for parents, especially when it comes to the potential impact on the kidneys and urinary tract. Crystal urine, or crystalluria, occurs when there are crystals present in the urine, which can be a sign of concentrated urine or other underlying issues. In your case, it sounds like your son has been experiencing this condition since he was four months old, and you have noticed that his urine is often a deep orange color, particularly in the morning.

Firstly, it’s important to note that the color of urine can be influenced by several factors, including hydration levels, diet, and even the time of day. A deep orange color often indicates concentrated urine, which can occur when a child is not adequately hydrated. Since your son is exclusively breastfed and has limited intake of water and solid foods, it’s crucial to ensure he is getting enough fluids throughout the day. Breast milk does provide hydration, but as he grows, he may need additional fluids, especially if he is not consuming much in terms of solids.

The presence of crystals in urine can sometimes be benign, especially if there are no signs of infection or other complications. However, it’s essential to monitor for any symptoms of urinary tract infections (UTIs), such as fever, irritability, or changes in urination patterns. Since your son has a history of UTIs, it’s wise to remain vigilant. Crystals can irritate the urinary tract and potentially lead to increased frequency of urination, which may explain why he seems to need to urinate often.

To address your concerns about the impact of crystalluria on your son’s kidneys and bladder, it’s reassuring to know that if the urine tests have ruled out infection and other serious conditions, the crystals themselves may not pose a significant risk. However, persistent crystalluria could indicate an underlying issue that might need further investigation, particularly if it continues or worsens.
One of the most effective solutions to manage crystal urine is to increase fluid intake. Encouraging your son to drink more fluids can help dilute the urine, potentially reducing the concentration of crystals. You might consider offering small amounts of water in addition to breast milk, especially during the day when he is awake. Introducing more hydrating foods, such as pureed fruits and vegetables, can also contribute to his overall fluid intake.

If the problem persists despite increased hydration, or if you notice any concerning symptoms, it would be advisable to consult a pediatric urologist or nephrologist. They can perform further evaluations, including urine tests and possibly imaging studies, to rule out any anatomical issues or metabolic disorders that could be contributing to the crystalluria.

In summary, while crystal urine in infants can be concerning, it is often manageable with increased hydration and careful monitoring. Ensuring your son is well-hydrated is key, and if issues continue, seeking further medical advice will help ensure his urinary health is maintained. Always feel free to reach out to your pediatrician with any ongoing concerns, as they can provide tailored guidance based on your son’s specific situation.

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