K.M.
Which foods you give your child depends on you (organic or not).
Our ped recommended this order (but ask your ped which order he/she recommends):
Cereal 1x a day for 2-3 weeks
Cereal 2x a day for 2-3 weeks
Yellow vegetables (squash, carrots, sweet potatoes)
Yellow fruits (bananas, applesauce, pears)
Green vegetables
All other fruits
Then if there happens to be anything I missed to go ahead and give it to her.
Of course, give her whichever solid you are feeding a minimum of 4 days on it only to make sure there aren't any allergic reactions to it. And the reason we stay on cereal so long is to get her used to eating and to make sure her digestion system was ready for it. It wasn't for any nutritional value whatsoever.
And at 6 months we're to start feeding her 3x a day instead of 2x.