I appreciate your query.
I am enclosing average fetal parameters at 38 weeks of pregnancy
38 weeks =19.61 inches =6.80 pounds =49.8 cm =3083 grams.
These are statistical averages, and a slight deviation from these is to be expected and is entirely normal.
Last trimester ultrasound
scans do not accurately estimate fetal age, hence deviation of one week is absolutely normal.
As you can very well make out, the growth of your baby is perfectly normal
Please be reassured.
All the best.