The normal value of humerus length at 24 weeks of pregnancy is between 4.36 ± 0.51 cm, the length has reached 30 cm and the weight has reached about 630 g. As long as it is within this range, there is no need to worry too much. Since each baby’s development is different and genetics are different, there will be some differences in height, weight, biparietal diameter and humerus development. If the fetal development is not too far from the standard values, there is no need to worry too much. Pregnant women can get more sunlight during pregnancy and should go to the hospital for regular maternity checkups. Also pay attention to a balanced diet and eat more foods with high vitamin and protein content. Do what you can to exercise and improve your immune system. Pay attention to the combination of work and rest, and avoid prolonged exertion. If you feel unwell, go to the hospital for a check-up as soon as possible. In addition, the use of drugs during pregnancy should be treated under the guidance of a doctor to avoid the use of wrong drugs that may lead to abnormal fetal development.