6m9days old not very keen to eat solids

Hi, ive started my boy on solids a week ago, but realised he doesn't want to open his mouth fully, sometimes even turn away from the spoon. He does not respond to solid as well as my olderboy, who is more enthusiastic... Ive fed him oat cereal (gerber) w BM, Apple puree with BM, sweetpotato with BM, pumpkin with BM and eggyolk with BM so far. All his response not very eager. What should I do?