Solids schedule

How often, what, and how much are you feeding your baby solids/purees/etc? I remember for the longest time I fed my first baby just twice per day but my current 7 month old seems to want to eat breakfast too. I have normally just been giving him little bits of what I have for breakfast but I'm wondering if I should add in some baby cereal or something. I normally give him a pureed veggie and a fruit later in the day, sometimes yogurt. I just know they say to keep the amount of breastmilk the same for the first year and complement with food, so I dont want to give him too much food and have my breastmilk dwindle. I also just sleep trained him so I'm worried about him not getting enough calories. He is a little guy and I want to keep his weight up, but in the right way!