Starting Solids!! 😨😨🤔🤔

I took my 3 month old daughter to the doctor because I thought she had acid reflux. She threw up after every feeding and I'm constantly washing blankets! The doctor informed me to sit her up for 20 to 30 minutes after eating to see if that helps....which didn't!! She said if that didn't work to give her rice cereal in a bottle, however, I EBF and have never given her a bottle. I also asked when it would be a good time to start solids and she told me 4 months!!!! She said I can start stage one baby food once a day in the afternoon and feed her rice cereal in the morning and at night. She also said 80% of babies are ready for solids at 4 months and the other 20% are not. That's the earliest I have ever heard and it came from a pediatrician!! 😱😱 I ended up spoon feeding her rice cereal twice a day, morning and night and it seems to have helped with the reflux. My princess is eager to eat regular food.......every time I cook or the family is eating she is practically drooling and licking her lips and I feel so bad!! Lol! She will be 4 months next Wednesday. Has anyone else got the green light for solids at 4 months for there LO or is her doctor is crazy!