for melon.. do we need to steam it before feeding?Anything that they can hold and is easy to mush with their gums. Steamed vegetables like carrots broccoli, sweet potato, toast fingers, sliced fruits like melons, strawberries, bananas. It's more of letting them try different tastes and textures than getting them to eat.
Check out baby led weaning. I did this with both my kids. Partially with my son and with my daughter she had finger food as her first food at 6 months. No baby cereal or purees.