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Frequency distribution by feeding type of the included infants at the start of the studies
| Type of feeding at inclusion in the studies | Number of studies | % of studies |
|---|---|---|
| Exclusively breastfed | 6 | 19 |
| Exclusively formula‐fed | 6 | 19 |
| Mixed feeding | 13 | 42 |
| Not reported | 2 | 7 |
| Unclear | 4 | 13 |
