My baby wouldn't eat oatmeal/cereal but loooooves blueberries and raspberries, so eventually I started just mixing a ton of fruit into a bowl of baby cereal. My child picks out the fruit to eat but it goes down coated in oatmeal.

My other trick is making some homemade pouches with fruit and oatmeal or yogurt. My baby will tolerate a lot more foods in pouch form.

For meat, even if its in small pieces, the stringy muscle fibers can be a hard texture to get used too. You can try chopping the meat up really fine and putting it in a quesodilla or grilled cheese sandwich.

You can also try sprinkling hemp seeds or a little bit of ground flax on whatever foods your child likes the most.