It's typical for newborns to gain about 5 to 7 ounces per week. However, every baby is unique; some may gain more or less weight than others.
One important caveat: newborns often lose weight after birth. This is normal. Your pediatrician will monitor your baby's weight to ensure they resume a healthy trajectory.
Your pediatrician will also speak about your baby's growth in percentiles. They will measure height, weight, and head circumference and enter this information in either the World Health Organization (WHO) Growth Chart or the Centers for Disease Control (CDC) Growth Chart. While similar, there are some differences in the two growth charts for infants, so be sure to check with your doctor which one they are using and why they think it is best for your baby.
There's no need to be concerned if your baby is in a "below average" or "above average" percentile. What matters most is that your baby is tracking steadily on their own curve, not necessarily that they're tracking average.
Instead of fixating solely on weight gain, focus on your baby's overall well-being. Pay attention to their feeding cues and the number of wet diapers they produce daily, as these are reliable signs that your baby is getting enough nourishment.