J.K.
My children were in a similar situation, breastfed exclusively until about 8 months and I worked FT. One thing I noticed with my younger daughter is that bananas and carrots would cause her to get constipated. As soon as I stopped feeding them to her, she was fine. I waited until her digestive system developed a little more and then she was able to eat bananas with no problem. Now they are one of her favorites.
Good luck!