Usually works by introducing one new food a week. So pears for a week, then apple, then pumpkin etc. That way you can see if there are any reactions etc. Once you have introduced the food then you can mix it together, if that makes sense. They can have their food at room temp for when you go out, just choose something thats suitable for that. I gave DD1 rafertys food pouches when we were out as they dont have any of the added nasties in it. Easy to use and take with you.. you just squirt it straight onto a spoon.

Do have a look at the BLS though