Breastfeeding when food is the main source of food

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Guys, I'm honestly curious. Not trying to be rude or anything, but why do you guys keep breastfeeding, once your childs main food source is solids? I understand there is still nutritional value but not as much as there was before? Is it for your baby's comfort or is it for the mom's? I'm honestly curious, is it because mom's are not ready or baby is not ready? Please dont be rude, I'm genuinely curious. Currently 30 weeks pregnant and I plan on breastfeeding.