The present invention relates generally to herbal milk replacer compositions for feeding animals, particularly young animals, and its method of making and feeding, and more particularly relates to shelf-stable and cheaper herbal milk replacer compositions for body weight gain along with overall development of calves to early complete functional maturity and also prevents any infection by acting as immunobooster. The herbal milk replacer compositions comprises effective amount of an mixture of herbal extract and/or at least one bioactive fraction from medicinal herbs and one or more additives selected from Energy Source, Protein Source, Chelated/organic Mineral Mixture, Vitamins, Salt, Toxin destroyer and Biocide; and process for the preparation of such extracts and herbal milk replacer compositions. The mixture of herbal extract comprising medicinal herbs selected from Emblica officinalis, Tinospora cordifolia, Embelia basaal, Cyprus rotundus, Asparagus racemosus and Lepidium sativam. The effective amount in the composition is 1 to 10% (w/w) herbal mixture, 30 to 70% (w/w) Energy Source, 20 to 70% (w/w) Protein Source, 2% (w/w) Chelated/organic Mineral Mixture, 1% (w/w) Salt, 0.1% (w/w) Vitamins, 0.1% (w/w) Toxin Destroyer, 0.03% (w/w) Biocide.