| 2′-FL | 2′-fucosyllactose |
| 3′-GL | 3′-galactosyllactose |
| 4’-GL | 4’-galactosyllactose |
| AD | atopic dermatitis |
| AE | adverse event |
| ATCC | American Type Culture Collection |
| DFL | difucosyllactose |
| DP | degree of polymerisation |
| Caco | adenocarcinoma of the colon |
| CBA | chocolate blood agar |
| CFU | colony forming units |
| CMA | cow’s milk allergy |
| DNA | deoxyribonucleic acid |
| DSM | Dutch State Mines |
| EFSA | European Food Safety Authority |
| ESPGHAN | European Society for Paediatric Gastroenterology, Hepatology and Nutrition |
| FDA | U.S. Food & Drug Administration |
| FL | fucosyllactoses |
| FOS | fructo-oligosaccharides |
| FUT2 | fucosyltransferase 2 |
| GOS | galacto-oligosaccharides |
| GL | galactosyllactose |
| GRAS | generally recognized as safe |
| HM | human milk |
| HMO | human milk oligosaccharide |
| IF | infant formula |
| IgE | immunoglobulin E |
| ISAPP | International Scientific Association for Probiotics and Prebiotics |
| kDa | kilodalton |
| LA | Lactobacillus acidophilus |
| LB | lysogeny broth |
| LNnT | lacto-N-neotetraose |
| LNT | lacto-N-tetraose |
| NCDO | National Collection of Dairy Organism |
| NCIMB | National Collection of Industrial, Food and Marine Bacteria |
| NEC | necrotizing enterocolitis |
| QPS | qualitative presumption of safety |
| RNA | ribonucleic acid |
| SCORAD | scoring atopic dermatitis |
| scGOS/lcFOS (9:1) | short-chain GOS/long-chain FOS (in a ratio of 9:1) |
| SCFA | short-chain fatty acid |
| SEM | standard error of the mean |
| SL | sialyllactose |
| spp | subspecies |