Digestive Issues in Infants: Is Sour Stool Normal?

Q: Digestive Issues in Infants: Is Sour Stool Normal?

Hello： 1. Typically, stool is alkaline or neutral (pH values ranging from 7.0 to 7.5). Newborn stool is slightly acidic, with a pH of 5.0 to 7.5. The pH of stool depends on the diet and bacterial fermentation in the small intestine. Carbohydrates tend to make

Gastrointestinal issues

Recently, the nanny has been insisting that I buy Xinfang Feiming or Ruoyuan tablets for my daughter.
She says that the sour smell of my daughter's stool indicates that undigested food is fermenting.
However, I remember that my daughter has always had a slightly sour stool smell since she was little.
Doctor, is it normal for a child to have a sour stool smell from a young age? Now that she is 6 months old, fully on formula and starting solid foods, is it normal for her stool to smell sour? What factors could cause a sour stool smell? Are the two types of probiotics suggested by the nanny safe for a 6-month-old, and will they be effective? I have quite a few questions; thank you for your help, doctor.

Xiu Mami, 30~39 year old female. Ask Date: 2021/08/14

Dr. Pei Rensheng reply Pediatrics

Hello:
1.
Typically, stool is alkaline or neutral (pH values ranging from 7.0 to 7.5).
Newborn stool is slightly acidic, with a pH of 5.0 to 7.5.
The pH of stool depends on the diet and bacterial fermentation in the small intestine.
Carbohydrates tend to make the pH acidic, while protein breakdown results in an alkaline pH.

2.
At 6 months of age, the primary diet consists of formula or breast milk, with complementary foods as a supplement; stool may still be slightly acidic.

3.
Both Yuanjian and Xinjiaofenming contain probiotics, which can aid digestion.

4.
If the stool feels acidic, have you considered testing the pH level? The consistency and frequency of the stool are more important observation points! Wishing you health and happiness!
Best regards,
Ren Sheng

Reply Date: 2021/08/14

More Info

When it comes to understanding digestive issues in infants, particularly regarding the odor of stool, it's important to consider several factors. First, it's not uncommon for infants to have stools that have a sour smell, especially when they are consuming a diet that includes formula milk and solid foods. The digestive system of infants is still developing, and their gut flora is in the process of establishing itself. This can lead to variations in stool odor, consistency, and frequency.

In your case, your daughter is six months old and is on a diet of formula milk along with some solid foods. The sour smell of her stool could be attributed to several factors:
1. Dietary Changes: As infants start to eat solid foods, their stools can change in odor and consistency. Foods that are high in carbohydrates, such as fruits and certain vegetables, can ferment in the gut, leading to a sour smell. If she has recently started eating new foods, this could be a contributing factor.

2. Formula Composition: Different formulas can affect stool odor. Some formulas contain ingredients that can lead to a more acidic stool. If you have recently changed her formula or if she is on a specific type of formula, this could also be a reason for the sour smell.

3. Digestive Health: While a sour smell can be normal, it can also indicate digestive issues such as malabsorption or an imbalance in gut bacteria. If your daughter is experiencing other symptoms such as diarrhea, excessive gas, or discomfort, it would be wise to consult a pediatrician.

Regarding the suggestions made by your caregiver about using probiotics like "欣表飛鳴" or "若元錠," these are typically considered safe for infants and can help promote a healthy gut flora. Probiotics can be beneficial in managing digestive issues, but it’s essential to consult with your pediatrician before introducing any new supplements, especially for infants. They can provide guidance on the appropriate type and dosage based on your daughter's specific needs.

In summary, while a sour smell in your daughter's stool can be normal, especially with her current diet, it's crucial to monitor her overall health and any accompanying symptoms. If you have concerns about her digestion or if the stool odor changes significantly, it would be advisable to seek medical advice. Your pediatrician can help determine whether any further investigation or treatment is necessary.

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