What Is Lactose?
Lactose is the natural sugar found in:
- Breast milk
- Cow’s milk
- Dairy products
- Infant formula containing milk
To digest lactose properly, the body uses an enzyme called lactase. When the body does not produce enough lactase, lactose may not be fully digested, which can lead to digestive symptoms.
Is Lactose Intolerance Common in Babies?
True lactose intolerance in young infants is relatively uncommon, especially from birth.
Some babies may experience temporary difficulty digesting lactose after Stomach infections, Diarrheal illness and Intestinal irritation. Symptoms may improve once the digestive system recovers.
Common Symptoms
Symptoms may vary depending on the baby’s age and the amount of lactose consumed. Possible Signs Include:
Excessive gas, Bloating, Diarrhea, Stomach discomfort, Fussiness after feeds, Frequent loose stools, Abdominal swelling
Symptoms often appear after feeding.
Lactose Intolerance vs Cow’s Milk Protein Allergy
These two conditions are often confused, but they are different.
Lactose Intolerance: It Involves difficulty digesting milk sugar.
Cow’s Milk Protein Allergy: It Involves the immune system reacting to milk proteins.
Milk protein allergy may also cause: Skin rashes, Vomiting, Blood or mucus in stools, Eczema, More significant feeding issues
Because symptoms can overlap, medical evaluation may sometimes be necessary.
Should Parents Change Formula Immediately?
Parents should avoid changing formulas repeatedly without medical guidance.
How Is Lactose Intolerance Diagnosed?
Doctors usually evaluate:
Symptoms, Feeding history, Growth patterns, Stool changes, Medical history
In some cases, temporary dietary adjustments may help determine whether lactose is contributing to symptoms.
Managing Symptoms
Treatment depends on the cause and severity of symptoms. Management May Include:
- Temporary lactose-reduced formulas if recommended
- Treating underlying stomach illness
- Monitoring hydration
- Adjusting feeding practices
Breastfeeding is often still encouraged unless a healthcare professional advises otherwise.
When Should Parents Seek Medical Advice?
Parents should contact their pediatrician if the baby has:
Poor weight gain, Persistent diarrhea, Blood in stools, Vomiting, Signs of dehydration, Significant feeding difficulties, Severe discomfort after feeds
Professional evaluation helps ensure babies receive the correct diagnosis and appropriate care.
