Immune stimulatory infant nutrition

The invention provides a nutritional or pharmaceutical composition containing a fat component, a protein component and a carbohydrate component and comprising whey and casein. Said composition is characterized in that, the weight ratio of casein to whey is 1:1 to 1:2.4 and that the composition contains: a) at least 3 grams arginine per 100 grams protein; b) at least 10 wt.% linoleic acid based on total fatty acids; c) at least 1 wt.% alpha linolenic acid based on total fatty acids; d) at least one long chain-polyunsaturated fatty acid in an amount exceeding 0.1 wt.% based on total fatty acids, said long chain polyunsaturated fatty acid being selected from the group consisting of docosahexaenoic acid, arachidonic acid and eicosapentaenoic acid; e) 5 to 25 wt.% of at least one polyunsaturated fatty acid based on total fatty acids; and f) 2 to 12 grams indigestible oligosaccharides having a degree of polymerisation of 2 to 100 per 100 gram dry weight of the composition. The composition of the invention reduces -among others- the risks attached to feeding whey dominant infant formula.