Need advice from someone that has started weaning

I started introducing baby porridge once daily to my son 2 days ago. First day he probably didn't even take 1oz and yesterday he finished the 1oz I made him. Today he was so excited and I made 1.5oz and he loved it so I made another 1.5oz meaning he ate 3oz and was looking for more. How much is okay to feed him in one sitting? Hes gone off his bottles I think due to teething but seemed to enjoy the food. I was going to stick to baby porridge for another couple of days then try pureed carrots for his Xmas lunch and then start to introduce different vegetables.