We have trouble with my ds2 (17 months as well) to get him to eat anything really. He goes through stages, at the moment he is cutting eye teeth and is barely eating anything except for fruit. I just keep offering and every now and then he surprises me. Last night he ate a whole plate of corn meat, peas and carrots. I don't stress about it too much. He'll eat when he's hungry, he's certainly not suffering. I just make sure his other meals are balanced and we get by with that.