Grayish Stool After Switching to Goat Milk Formula: What to Know - Pediatrics

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The stool is grayish in color after switching formulas?


My daughter just turned one year old, and I switched her formula to one that contains 15% goat milk.
However, after she drinks the milk in the evening, she has a bowel movement that resembles grayish, clay-like stools, but this only happened once.
Could this be related to the formula change? I also added a bit of probiotic supplement for her.
Thank you for your help.

Tseng Pei-Wen, 30~39 year old female. Ask Date: 2015/11/20

Dr. Xiao Kaiwen reply Pediatrics


As long as the stool does not contain blood, is not watery, hard, or persistently grayish-white, it is considered normal and acceptable.
Infant formula that has passed government inspection and is safe for infants to consume is acceptable.
If a baby does not adapt well to a formula change, it typically results in vomiting, diarrhea, or the development of rashes.

Reply Date: 2015/11/20

More Info


When transitioning your child to a new formula, such as one that contains goat milk, it’s not uncommon to notice changes in stool color and consistency. In your case, the grayish stool after introducing a formula with 15% goat milk could be attributed to several factors, including dietary changes, the introduction of probiotics, or even the body’s adjustment to the new formula.

Firstly, goat milk is known to have a different composition compared to cow's milk. It contains smaller fat globules and a different protein structure, which can sometimes lead to variations in digestion and absorption. This can result in changes in stool color and consistency. A grayish stool may indicate that the fat content in the stool is higher than usual, which can happen if the body is not fully digesting the fats from the goat milk.
Moreover, the introduction of probiotics can also influence stool characteristics. Probiotics are beneficial bacteria that can help balance the gut microbiome, but they can also cause temporary changes in digestion as the body adjusts. If your daughter is new to probiotics, her digestive system may be reacting to the introduction of these new bacteria, which could also contribute to the change in stool color.

It’s important to monitor your child's overall health and any accompanying symptoms. If the grayish stool persists, or if you notice any other concerning symptoms such as diarrhea, constipation, or signs of discomfort, it would be wise to consult a pediatrician. They can evaluate whether the stool changes are a normal part of the adjustment process or if they indicate a need for dietary modifications.

In general, when switching formulas or introducing new foods, it’s advisable to do so gradually. This allows the digestive system to adapt more smoothly and can help you identify any specific ingredients that may not agree with your child. If you suspect that the goat milk formula is the cause of the stool changes, you might consider reverting to the previous formula temporarily to see if the stool normalizes.

Lastly, while goat milk can be a nutritious alternative to cow's milk, it’s essential to ensure that your child is receiving a balanced diet that meets her nutritional needs. Goat milk is lower in folate and vitamin B12 compared to cow's milk, so if you continue with this formula, you may need to ensure that these nutrients are obtained from other dietary sources or supplements.

In conclusion, while a change in stool color can be concerning, it is often a normal response to dietary changes. Keep a close eye on your daughter’s overall health, and don’t hesitate to reach out to a healthcare professional if you have any concerns. They can provide personalized advice based on her specific situation and dietary needs.

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