In 24 wk scan,BPD
is almost 61 mm but may varies up to +/- 3 mm. So BPD 57.4 mm will be considered normal and may grow up/develop in later months. Other parameters are also within normal range.
Don't be much worried. Do a USG scan on 32 wk to know feto-placental well being in details.
Take healthy protein rich diet,continue Iron & other vitamins/nutrients, Avoid stress
,Take adequate rest,avoid heavy work/long journey and do periodic check up.