Eating before 6 months?

I’m just wondering how many people got the okay to feed their babies before 6 months? Im just curious also how many months? was your baby when you did get the okay. I AM NOT IN A RUSH GO FEED MINE BEFORE 6 MONTHS And YES I’ve heard it can mess with their Digestive system. My mom was just talking and I wanted to see how many people actual do go with what the doctor says and their okay.