1. The composition of the nutritional supplement for breast-fed children or pets, comprising at least one probiotic and at least one nutrient selected from the most variable nutrients in human breast milk. The composition of claim 1, wherein the nutrient is selected from vitamins, provitamins, carotenoids, polyunsaturated fatty acids, long chain polyunsaturated fatty acids, minerals, amino acids, peptides, or any mixtures thereof. The composition according to claim 1 or 2, in which the nutrient is any substance from docosahexaenoic acid (DHA), arachidonic acid (ARA), alpha-linolenic acid, carotenoids, such as, for example, lycopene, lutein, alpha-carotene, beta -carotene, beta-cryptoxanthin, zeaxanthin, calcium, iron, zinc, copper, iodine, selenium, thiamine, riboflavin, vitamin B6, vitamin B12, folic acid, vitamin C, vitamin D, vitamin A or any mixtures thereof. 4. The composition of claim 3, wherein said nutrients include a mixture of docosahexaenoic acid and alpha-linolenic acid, optionally with carotenoids. A composition according to claim 1, wherein the probiotic is selected from lactobacilli, bifidobacteria, enterococci, yeasts (Saccharomyces) or streptococci, preferably Lactobacillus rhamnosus, Lactobacillus paracasei, Lactobacillus reuteri, Lactobacillus acidophilus, Lactobacillus johnsonii, Lactobacillus plantarum, Lactobacillus salivarius, Streptococcus thermophilus, Bifidobacterium longum, Bifidobacterium lactis, Enterococcus faecium, Streptococcus sp. and Saccharomyces boulardii or any mixture thereof. 6. The composition according to claim 1 or 2, comprising at least one prebiotic, preferably selected from human milk oligosaccharide, more preferably �1. Композиция питательной добавки для вскармливаемых грудью детей или домашних животных, включающая, по меньшей мере, один пробиотик и, по меньшей мере, одно питательное вещество, выбираемое из наиболее вариабельных питательных веществ в грудном молоке человека.2. Композиция по п.1, в которой питательное вещ
