My daughter is just five and a half months old and yesterday I started her on solids. Before that, she was exclusively on breast milk. I gave her a packaged wheat and apple baby food. Two hours after she ate it, she vomited everything out. So, the rest of the day I just gave her breast milk. I had mixed one teaspoon of the powder with 30 ml of water. Is there anything to worry about? Also, what can I give as a substitute? There is no sign of weakness or discomfort. Also her neck is not yet fully stable and she still cannot sit on her own unless supported on our lap. Is this normal?