It is natural for expectant mothers to have concerns about their baby's weight during pregnancy. At 21 weeks, the average fetal weight is around 360 grams, so your baby's weight of 389 grams falls within a normal range. However, it is important to remember that every pregnancy is different, and there can be variations in fetal weight. Factors such as genetics, maternal health, and nutrition can influence the baby's growth rate. If you have any specific concerns or if your healthcare provider has expressed any worries regarding your baby's weight, it would be best to discuss them with your doctor. They will be able to provide personalized guidance based on your individual circumstances and ensure the well-being of both you and your baby throughout the remainder of your pregnancy.