Your baby can have symptoms of Dairy Allergy/Cow’s Milk Allergy even if you are exclusively breastfeeding and not directly feeding your baby any dairy.
Firstly, your breastfed baby is never allergic to your breastmilk, so you don’t need to wean your baby. However, your baby may be upset by dairy in your diet, as large protein molecules from cow’s milk pass through your Breast Milk. It’s these protein particles that can affect sensitive babies.
Cows’ Milk Allergy in babies may cause symptoms including:
Digestive problems – such as stomach cramps, bloating, colic, nausea, vomiting, reflux, diarrhoea (with mucous or specs of blood in the poop) or constipation. These symptoms can result in poor weight gain.
Around the middle of your baby’s first year, that is at about six months, your baby will start showing signs that he is ready for family foods: he will be able to sit up in a high chair or on your lap; he will have lost the tongue thrust reflex (that protects him against choking in the early months, but also means food gets thrust out of his mouth, rather than swallowed); he will be watching you closely as you eat and probably reaching for your food - but being able to grab objects and put them into his mouth is an actual sign of readiness ( after all, even young babies will watch you and may reach for food). Your baby may seem to suddenly be more hungry but not satisfied by extra milk feeds over a period of several days.
See how, when and what to help your baby transition from breastfeeding to family foods