Lactose intolerance in babies is quite rare. It can occur in premature babies or as secondary lactose intolerance after a stomach bug or another gut issue. In very rare cases, it’s inherited from both parents and present from birth. More often, it develops later, in childhood, the teens, or adulthood.

What is lactose intolerance in babies?

Lactose intolerance occurs when the body is unable to produce enough lactase, a digestive enzyme that breaks down lactose, the main sugar in milk. When a baby is unable to digest lactose, it can cause some uncomfortable symptoms.

Milk allergy vs lactose intolerance

Lactose intolerance is not the same as a milk allergy. A milk allergy is an immune reaction, whereas lactose intolerance is a problem with the digestive system.

How do I know if my baby is lactose intolerant?

Symptoms that may occur with lactose intolerance in babies include:

None of these is fun for your little one, so they may also be unsettled and cry.

How is lactose intolerance in infants treated?

Seek advice from your baby’s doctor or healthcare professional if you suspect lactose intolerance. They can assess the cause of your baby’s symptoms and advise you on how to ensure your baby continues to receive the nutrients they need.

For breastfed babies, a healthcare professional may advise lactase drops in some circumstances. You generally do not need to remove lactose from your own diet because the amount of lactose in breast milk is not determined by how much lactose the mother consumes.

For formula-fed babies, your doctor or healthcare professional can advise whether a lactose-free or other appropriate formula is necessary. Avoid changing your baby’s formula without first seeking professional advice.

If your baby is older and eating solid foods, speak to a healthcare professional before restricting foods containing lactose. This helps ensure that any dietary changes are appropriate and that your baby continues to receive the nutrients needed for healthy growth and development.

When to seek further support

Lactose intolerance in newborns is uncommon, and with the right advice, it can be managed while keeping your baby well fed and comfortable. If you think your baby may be lactose intolerant, speak to a doctor or healthcare professional before changing their milk, formula or diet. They can help determine whether the symptoms are linked to lactose intolerance, a cow’s milk protein allergy or another feeding issue.

For more guidance and tips, explore the Karihome blog.