We have a fantastic natural mom and author here in South Africa who has written a book "Mila's Meals" about First Foods. More specifically catering for sensitive or allergic children. I think the book is available internationally so have a look.

My little boy tries pretty much everything but he's got definite preferences. And some interesting tastes; lemon and garlic! Because we farm orgnanically and I make everything from our produce he tries very diverse foods. He loves bone broth and fruit smoothies and goats milk yoghurt. They may be time consuming but I make in bulk and freeze in small portions.