Baby not interested in food

I’m kind of getting concerned. My baby just turned 7 months and has no interest in real food. We have tried carrots, apples, avocado, banana, sweet potato, but it’s like she doesn’t know how to eat I spoon feed her and then she spits it all out and sometimes she won’t even open her mouth for the spoon. Any advice would be great she was a month premature so idk if that could have any affect?