I am certainly not an expert in this. My Joshua sure has many changes in his eating habits quite often. At times he dranks his bottles completely, other times he likes solids more than milk, then others he likes milk more than solids. There has even been a time when he would not touch solids.
My LO has been on solids since 4 months and he hit a stonewall after his 6 months shots when he started to refused his solids. This happened for a few days. Then, I started to offer him a bit of the solids before his milk, then I give him ALL his milk and then followed it with more solids. He still does not eat all his solids like he used to but at least he is eating it. BTW, before his 6 months, he used to eat his solids after his milk. He actually was not drinking his milk to well, but he sure enjoyed his solids.
Hope this helps.