Many of my little patients can be resistant to trying new foods, particularly the green ones! Know that fussiness in children can be quite normal, and sometimes it can take up to 20 times of seeing a new food for a child to try it, and then even longer before their taste buds can appreciate, or even tolerate it.
Sometimes fussy eating is caused by nutritional deficiencies such as zinc, which is involved in many stages of the digestive process, including the ability to taste food normally, and iron deficiency, which will usually be accompanied by unusual cravings such as wanting to eat ice or sand, or loving the smell of nail polish or petrol. In these cases, obviously a multivitamin is warranted, and can make the world of difference if you persist with supplementation for at least a few months. Another great tip for reversing iron deficiency, is purchasing an iron fish from www.ironfish.com and cooking meals with it. See their website for more details.