OK. Let's talk about the components in milk. I have fairly horrid lactose intolerance, but it is really rare for babies to have it. lactose intolerant babies are really really sick and they don't gain weight.
1) Lactose is a sugar. Breast milk is full of it, and it is believed to be in there because it is the most efficient fuel for growing brains. Regardless of what you eat your breastmilk will be full of lactose. I think your naturopath has no clue about breastfed babies and is basing his/her advice on what might happen in older kids and adults.
2) Cow's milk protein can cause reactions. And some of it passes through to bub from you - so if she is sensitive to this protein then you removing it from your diet will help. The dairy foods highest in protein are the really solid ones (i.e. cheese) - which are also the lowest in lactose.
Things get very muddly because the gut inflammation from response to cows milk protein can produce temporary partial lactose intolerance (i.e. very grumpy farty baby). But this should settle once her gut heals a bit.
If you think your baby is suffering from lactose overload (i.e. getting more lactose than she can handle) it is usually best to try block feeding. This is where she gets one side until she has well and truly drained it (even if it takes two feeds to do so) before she gets the other.
Other things that sometimes make for grumpy babies are the general onion/garlic family and caffeine.
As she gets a bit bigger she will cope better - at 6 weeks she still has a weak valve at the top of her tummy, and she's still learning to pooh and fart.
Hang in there!
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