My son is 19 months and has also never liked milk. He drinks calcium enriched orange juice, which has the same amount of calcium as milk. He does eat yogurt and cheese though. Does your DS like yogurt? You could make smoothies with milk, yogurt and fruit. We keep offering ds milk in the hopes that one day, he will like it, but the pediatrician said not to worry too much, because he is drinking the orange juice. Is it really important that he like milk, or are you mainly worried about the calcium intake?