The invention relates an age-tailored nutrition system for an infant from birth to two months. The system comprises a first infant formula having a protein source comprising whey and optionally casein proteins and having a whey:casein ratio between 100:0 and 60:40 and a protein content between 2.0 and 3.0g protein/100 kcal. The system further comprises a second infant formula having a protein source comprising whey and casein proteins and having a whey:casein ratio between 70:30 and 50:50 and a protein content between 1.8 and 2.0g protein/100 kcal. The protein content or the whey:casein ratio of the second formula or both is/are lower than for the first formula
