Zoetermeer-based food group Royal Numico has posted Q1 sales of €1.05bn, flat over the same period last year.   The Infant Nutrition, Clinical Nutrition and Consumer Diets and Sports categories posted sales growth during the Q1 of 4%, 10% and 6%, respectively. This performance followed a particularly strong Q4 for these product groups. In the US, the market for Vitamins and Herbs remains weak, contributing to an overall sales decline in the US of 4% from Q1 2001 although US sales show an improvement of 6.7% from Q4 2001, to reach €625m.