Is Your Baby's Formula Causing Loose Stools? Expert Advice - Pediatrics

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Drinking formula milk can cause constipation?


Dear Doctor, my child is currently one year and one month old and is drinking Nestlé NAN Hypoallergenic formula.
He/she has bowel movements almost 1 to 2 times a day, sometimes with a soft consistency and occasionally a bit watery, but the soft consistency is more common.
I would like to know if I need to change the formula.
Thank you!

Youzi Ma, 30~39 year old female. Ask Date: 2017/10/01

Dr. Xiao Kaiwen reply Pediatrics


If the formula milk is not suitable, common symptoms include vomiting, diarrhea (which is usually severe), blood in the stool, and rashes on the skin.
If your child's stool is more frequent and has a different consistency than before, it does not qualify as diarrhea by definition.
At one year and one month old, your child should be able to eat a variety of complementary foods, even adult foods.
Trying a diverse range of complementary foods should lead to changes in the shape of the stool.

Reply Date: 2017/10/01

More Info


When it comes to your one-year-old child experiencing loose stools while consuming Nestlé's hydrolyzed formula, it's essential to consider several factors before deciding whether to switch formulas. Loose stools can be a common occurrence in infants and toddlers for various reasons, and understanding the underlying causes can help you make an informed decision.

Firstly, hydrolyzed formulas are designed for infants with specific dietary needs, such as those with allergies or intolerances to cow's milk protein. These formulas contain proteins that have been broken down into smaller peptides, making them easier to digest. However, some children may still experience gastrointestinal upset, including diarrhea or loose stools, when transitioning to or consuming hydrolyzed formulas. This could be due to the formula itself, the child's individual digestive system, or even other dietary factors.

It's important to monitor your child's overall health and behavior. If your child is otherwise healthy, gaining weight appropriately, and not showing signs of dehydration (such as decreased urine output, dry mouth, or lethargy), it may not be necessary to change the formula immediately. However, if the loose stools persist for an extended period, or if your child exhibits other concerning symptoms such as vomiting, fever, or irritability, it would be prudent to consult your pediatrician.

In addition to the formula, consider other dietary factors that may contribute to loose stools. Introducing new foods, especially fruits and vegetables high in fiber, can sometimes lead to changes in stool consistency. Foods like apples, pears, and prunes can have a laxative effect, resulting in looser stools. If you've recently introduced new solid foods, it might be worth tracking your child's diet to identify any potential triggers.

Another aspect to consider is the hydration status of your child. Loose stools can lead to dehydration, so ensure that your child is drinking enough fluids. If your child is primarily on formula and not consuming enough water or other fluids, this could exacerbate the situation.

If you are considering switching formulas, consult with your pediatrician first. They can provide guidance on whether a different formula might be more suitable for your child's needs. There are various types of formulas available, including those designed for sensitive stomachs or those that are lactose-free, which may be beneficial if lactose intolerance is suspected.

In summary, while loose stools can be concerning, they are not uncommon in young children, especially when dietary changes occur. Monitor your child's overall health, consider dietary factors, and consult with your pediatrician to determine the best course of action. If necessary, they can recommend a suitable formula or further investigate any underlying issues that may be contributing to your child's symptoms.

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