I know that it CAN be normal for bubs to refuse food at this age, however go with your gut. My son has been seeing a speech pathologist since he was 7 months old as he refused to eat, his little mouth would stay shut like a vice! It turns out that he has food intolerances which would have been making him feel ill plus he has swallowing issues which are related to his reflux, he also has a delayed swallow. He eats fine now, but took months of work with the speechie and has only just come off thickened fluids. Get him assessed byt a speechie if you are worried!