顶臀长
常见数字
| 妊娠期 | 顶臀长 |
|---|---|
| 6.1周: | 0.4厘米 |
| 7.2周: | 1.0厘米 |
| 8.0周: | 1.6厘米 |
| 9.2周: | 2.5厘米 |
| 9.9周: | 3.0厘米 |
| 10.9周: | 4.0厘米 |
| 12.1周: | 5.5厘米 |
| 13.2周: | 7.0厘米 |
| 14.0周: | 8.0厘米 |
估计公式: 妊娠期(周) = 顶臀长(厘米) + 6.5
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