Elasticwoman the weaning guidelines and advice for atopic children vary considerably from that given for children without an allergic family background.
PregnantGrrrl. I had a look around and I found this in the "Complete Guide to Food Alergy and intolerance" (it seems to be like the Bible for many atopic families, so there are good chances that there is one in the library)
Anyways, there is a table on page 262 with preventive measures during pregnancy, for this case the relevant ones, I think, are:
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"Don't eat too much of any one food while pregnant. It may also be worthwile avoiding foods that are potent allergens (listed below), but there is no firm evidence this is of benefit during pregnancy. Restricting your diet during breastfeeding is much more important for the baby"
[...]
"While BF avoid eating foods that are likely to cause allergic reactions: milk, eggs, peanuts, fish, citrus fruits, wheat, beef and chicken. To this list, add any food to which a previous child is allergic."
IMO, this seems a a bit extreme to me. Following such a restricted diet, particularly without the adequate advice on how to get the nutrients from other sources, may be quite tricky, nutritionally speaking. However, DS is allergic to most things in that list so I wonder if it would have been helpful for me to find this reference before DS was born!... the dubious benefits of hindsight!)
There is also a comment on pages 263-264 that strikes a cord:
"Even a baby that is never bottlefed is not entirely safe. Proteins from the mother's food can be absorbed intact from her gut and pass into her breastmilk. Although the quantities involved are small, there is little doubt that these can sensitize an atopic child. In fact, the most violent reactions to cows milk are seen in children who have been sensitized via breast milk, rather than those that have been bottlefeed from birth. This might seem like a good argument for bottlefeeding, on the face of it, but bear in mind that these violent reactions are rare, whereas the less severe but very troublesome symptoms that may result from bottlefeeding are far more widespread."
So... I guess that after all, it is a good idea to avoid dairy in your diet from the time being. But as I said in my previous post, if DS1 only has a slight intolerance, perhaps so many food restrictions have no point. Now, if he had the full catalogue of allergies and in a serious form, I would be telling you to restrict your diet and follow the advice to the letter.
Hope that is of help.