Humans may have the most complex breast milk of all mammals. Milk from a human mother contains more than 200 different sugar molecules,way above the average 30-50 found in, for example, and mouse or cow milk. The role of each of these sugars and why their composition changes during breastfeeding is still a scientific puzzle,but it's likely connected to the infant immune system and developing intestine microbiome. A Review of what's known and the different jobs of human breast milk appears April 19 in Trends in Biochemical Sciences.
Source: phys.org