Children will generally learn to enjoy foods, even vegetables, that they see others enjoy in a pleasant mealtime atmosphere. Offer vegetables again and again. If the child sees them often enough he will try them. However, refrain from pushing and prodding the child to try them. Just offer them at a later time.
Parents can be overanxious.
Take a look at your approach. In that way, eventually they learn to like them. If you try to force vegetables on your child, about the best you can hope for is that eventually he will grow up and eat his vegetables because he should , just like you do. Until your child accepts a variety of vegetables in his diet, offer other sources of Vitamin A. Keep in mind that serving sizes for a child are smaller than those for adults. A general guideline for a toddler and preschooler to be well-nourished is a serving size of about one tablespoon of vegetable per year of age.