Aw, that's normal pa lang talaga sa age na yan! A few of us had the same thing, some babies are just not ready for purees yet or they prefer a different texture, kaya don't stress. Since he'll be 7 months soon, you could try baby-led weaning instead if you're open to it, or mix the puree with breast milk to make it thinner and more familiar-tasting, pero honestly baka mas gusto niya ng soft finger foods na pwedeng hawakan niya mismo like banana or avocado pieces. Best to chat with your pedia about what's working best for his development though, especially kung concerned ka na hindi siya kumakain ng enough!