Kimberley,
Well done to Sophie for getting on so well with self-feeding, may I just offer a word of caution...?
At under 6 months, she still really needs her milk! Until at least 9 months, babies should be taking their pre-solid foods quantity of babymilk which should be at least 20oz per day. My experience of BLW is that babies actually take less milk as solid foods because they aren't having the runny cereal/milk mixes for breakfast, or the pureed veg in cheese sauce dinners, so really need to maintain their milkfeeds more than spoonfed babies - and because BLW means that they are not overfed on solid foods, this usually isn't a problem!
I don't mean to nag, but babymilk is sooooooooooooooooo important to developing young babies, it has all the vital fats and calories, and vitamins and minerals, that they need for healthy growth and development, whereas most common starter solid foods (carrots, yams, bananas, pears, rice/oat cereal etc) have some of the vitamins/minerals but virtually none of those essential fats/calories.
This means that they shouldn't be relied on for babies' nutrition, they should only supplement the milk, with the main reason for introducing solid foods being to get babies familiar with what food is and what to do with it in preparation for when it is an essential part of their diet at around 12 months old. BLW should ensure that this happens naturally!
Hope this makes sense?
Ax