Infants with low levels of 4 types of good gut bacteria had a 3x higher risk of allergies by the age 2. Many of these children developed asthma by 4yo

The allergy-prone children lacked anti-inflammatory polyunsaturated fatty acids and breast milk–derived oligosaccharides which caused an increase in inflammatory-producing immune cells and a decrease in immune cells that prevent autoimmune responses. Future studies will try and identify the exact causes of such disruptions in the infant microbiome including breastfeeding and mode of delivery.