Generally speaking, animal foods contain zinc. Animal foods include milk, meat, eggs, etc. The best source of calcium is milk. I suggest you try Dr. Duo's high calcium and zinc nutrient solution for your baby. This product is available in maternal and infant stores, and the quality is guaranteed. The ingredients of this nutrient solution in his family are all natural plants, which are mild and have no irritation to the stomach. Supplementing some vitamins and VD is helpful for nutrient absorption, and calcium and zinc are supplemented together, which is convenient and relaxed.