My daughter and grandson are both dairy intolerant/ allergic, not just lactose. I believe my daughter has had issues with dairy since birth. Her stools were constantly loose, terrible nappy rash, so her nappy had to be changed very often and projectile vomiting, but was healthy in every other respect, so there were no investigations. As she grew she had asthma, but not too bad, but made her puffed out if walking up hills, running, but was told she couldn't possibly have asthma as she didn't respond to asthma medication. A nutritionist helped her identify dairy products as the problem. Her breathing improved and she responds to reliever inhalers, but now rarely needs them. If she inadvertently digests any dairy product, she now has violent diarrhoea within a short time. And I mean violent and very sudden. Her son had the same symptoms when introduced to dairy products as a baby, but of course he didn't ingest dairy products through her milk, so it was very clear cut what the problem was. She is intolerant of eggs as well, but her son has no problem with them. The trouble with intolerance/ allergies is they are so individual and can change through life as I have found. With dairy and lactose intolerance though you have to be constantly vigilant when being prescribed medication as the majority of medication prescribed or over the counter contain lactose. Sadly doctors are not aware enough and my daughter had to check every time when she had pre eclampsia. On a brighter note, I do make a delicious dairy/egg free lion birthday cake, having put several recipes together. And there are some excellent allergy free recipe books on the market these days.