| Weight | Gestational Age | Inner Diameter (ID) |
|---|---|---|
| < 1000 g | < 28 weeks | 2.5 mm |
| 1000~2000 g | 28~34 weeks | 3.0 mm |
| 2000~3000 g | 34~38 weeks | 3.5 mm |
| > 3000 g | > 38 weeks | 4.0 mm |
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| Weight | Gestational Age | Inner Diameter (ID) |
|---|---|---|
| < 1000 g | < 28 weeks | 2.5 mm |
| 1000~2000 g | 28~34 weeks | 3.0 mm |
| 2000~3000 g | 34~38 weeks | 3.5 mm |
| > 3000 g | > 38 weeks | 4.0 mm |