Baby gone off purees

My son is 6 months on the 23rd. I have gradually introduced pureed veg to him over the last 4 weeks. He has about 2oz plain baby porridge in the morning and about 2oz of pureed veg in the afternoon but the last few days he's not shown any interest in the food and isn't even opening his mouth. I don't want to put him off food. He's not even got an appetite for his milk. I'm managing to get him to take about 20oz with a lot of encouragement. Hes about 18lbs and used to take about 34oz milk. I feel he's just not got his appetite. I actually started the food 4 weeks ago cause he had really gone off his bottles then and starting the food increased his appetite for about 2 weeks and now I feel like he had no interest in eating. Today he's had 3 bottles and baby porridge and that's it totaling 19oz and he's now in bed for the night. I've tried teething granuels and calpol and hadn't made any difference.

I'm thinking of stopping food for couple of days. What do you recommend and is anyone else's baby doing the same?