Symptoms of dairy allergy in breastfed babies, caused by cow's milk protein in the mother's diet, range from mild (eczema, fussiness, colic, blood/mucus in stool, vomiting, diarrhoea, skin rashes like hives) to severe (wheezing, trouble breathing, swelling of face/throat, floppiness/collapse, anaphylaxis), with reactions appearing minutes to hours after feeding, requiring urgent medical help for severe signs.
Green and frothy bowel motions may be a sign that the baby is receiving too much lactose, which has a rapid gut transit time. This may be due to an excess of the early less fat-rich milk or switching the baby between breasts before emptying one breast first. Babies may be very unsettled and windy.
Green, bloody, or mucus-tinged stool—along with some other issues—could indicate a milk allergy. If you suspect your baby has a cow's milk protein allergy, keep an eye out for these common issues that may occur shortly after feeding: wheezing, coughing, swelling, a rash, gas, crying, and unusual poops.
Breastfeeding mothers can eat whatever they have eaten during their lifetimes; they do not need to avoid certain foods. Babies love the flavors of foods that come through in your milk. Sometimes, though, a baby may be sensitive, not allergic, to something you eat, such as dairy products like milk and cheese.
In this case, the infant may show signs of severe colic, abdominal discomfort, or a skin rash such as eczema or hives, or may react with vomiting, severe diarrhea (often with blood in the stool), or difficulty breathing that lasts up to several hours after breastfeeding.
The "4-4-4 rule" for breast milk is a simple storage guideline: fresh milk is good for 4 hours at room temperature (up to 77°F/25°C), for 4 days in the refrigerator (39°F/4°C or colder), and up to 4-6 months (or longer) in a standard freezer (0°F/-18°C). It's a handy mnemonic, though some organizations like the CDC recommend up to 6 months in the freezer and the AAP up to 9 months, with deeper freezers offering even longer storage.
Common allergens include dairy, eggs, fish, shellfish, peanuts, tree nuts, wheat, and soy1. If you suspect your baby is allergic to something you are eating you may try cutting these out of your diet, one at a time, and see if your baby's health improves.
One study suggests that cow's milk peptides are no longer detectable in breastmilk just 6 hours after a mother ingests dairy products (12), but it is likely that there is considerable variability between lactating parents.
What Not to Eat While Breastfeeding
Symptoms look like a swollen lip or rashes, hives or respiratory impacts that occur within minutes to up to 2 hours after a baby has a bottle or eats a bit of yogurt or other milk containing foods. It's a rapid reaction. The second – non-IgE-mediated – typically has a delayed onset.
Symptoms of lactose overload
frequent large, runny poos which might be green, frothy or explosive* nappy rash (because the poo is more acidic) your baby being very unsettled. good or even large weight gains.
Immediate symptoms of milk allergy might include: Hives. Wheezing. Itching or tingling feeling around the lips or mouth.
Babies can be gassy as their gastrointestinal tracts get used to foods they are consuming. If your child seems excessively gassy and it has a foul odor, it may be a sign of a cow milk allergy, especially when it is in combination with some of these other symptoms.
Signs your breast milk might be upsetting your baby include excessive fussiness, colic, green/mucousy/bloody stools, skin rashes (eczema/hives), reflux, poor weight gain, and respiratory issues like wheezing, often pointing to a sensitivity to something in the mother's diet, most commonly cow's milk protein. Symptoms usually appear shortly after feeding and improve within days of removing the trigger food, but severe signs like breathing difficulty warrant immediate medical attention.
Eliminate all at once: Take out all cow's milk products, soy and eggs from your diet. Wait 2-4 weeks to see if baby improves. The food will clear from your milk in a few days, but baby's gut may take longer to heal.
Breastfeeding is the optimal way to feed a baby with cows' milk protein allergy, with individualised maternal elimination of cows' milk protein foods and fluids, and with adequate calcium and vitamin D supplementation to meet the mother's nutritional requirements during breastfeeding.
Rule #2: The Breast Milk Storage Guidelines.
The 4-4-4 Rule. Or the 6-6-6 rule. Basically, breast milk is good at room temperature for 4 or 6 hours, in the refrigerator for 4 or 6 days, and in the freezer for 4 or 6 or 12 months. Different professional organizations have varying recommendations.
A quart or more of orange juice or a diet heavy in seasonal fruits such as strawberries, melons or cherries have been associated with diarrhea and colicky symptoms in some infants. Foods containing many preservatives, additives or dyes have been associated with signs of discomfort in some babies.
The "5-5-5 Rule" for breastfeeding is a simple guideline for storing expressed milk: 5 hours at room temperature, 5 days in the refrigerator, and 5 months in a freezer, though variations like 4-4-4 or 6-6-6 exist, with stricter rules (4-4-4) often recommended for warmer conditions, emphasizing getting milk into the fridge quickly. There's also a postpartum 5-5-5 rule for rest, suggesting 5 days in bed, 5 days near the bed, and 5 days near home to aid healing.
Periods of unexplained crying. Diarrhea. Hives, rash, or eczema prone skin. Mucousy stools.
This is called Non IgE mediated allergy and is the most common type of milk allergy in infants. Symptoms tend to develop from 2 hours after drinking milk but can take up to 72 hours. If cow's milk continues to be consumed in the diet, the immune system will continue to produce symptoms over days or even weeks.
If you think your infant is allergic to milk, call your baby's doctor. The doctor will examine your baby, and might order some stool tests and blood tests. The doctor may refer you to an allergist, who might do skin testing.
“Very little food protein is passed through breast milk directly to the baby, so the chances that your baby will have a true allergic reaction to something you eat is very, very small.”
The eight foods responsible for about 90% of food allergies are milk, eggs, peanuts, tree nuts, fish, shellfish, soy, and wheat. A ninth allergen, sesame, was recently added to this list in the U.S., making it the "Big 9" due to its prevalence and the severe reactions it causes.
But by month three or four, many moms experience a new phenomenon wherein their baby has figured out how to latch on and empty the breast much faster than before. Many babies prefer to feed for shorter periods during this time. They may seem fussy and might even start rejecting the breast or seem distracted.