I had trouble with people disagreeing with me giving DS solids to, and the most vocal ones were people without a prem bub but somehow "knew" what was right for him. How can anyone say that your bub feeling better and sleeping better is a bad thing? Dont listen to them hun, you're doing what is right for you little man. My little guy was also underweight by his actual age but was just on if we went by corrected. His weight gain increased steadily when he began solids. Have fun on the solids journey, aaah the joys puree food lol.