Re: I'm so confused about starting solids. Need guidance.
All of the doctors we have been to do not refer to rice cereal as "solids" so maybe that's the problem? At my son's last appointment (2 months) the doctor said to wait until after the next appointment (4 mo) to start cereal and the 6 month appointment to start solids. That's what they have all said when all my kids were babies. I'm not sure what the official recommendations are but I have always thought that it was weird that they talked about solids and cereal as two different things.
You might think about introducing some vegetables soon. Many babies will resist vegetables once they have fruit because fruit is all sweet and yummy.