Measurements at 21 weeks

Kaly

Question: is anyone’s baby measuring small?

Backstory: I had my anatomy scan at 19 weeks and it showed baby measuring right on track to the day, but weight was a little small in my opinion- dr said average. Booked a private US today at 21 weeks and now weight seems to be on track (13 ounces) but femur/skull were measuring 6 days behind.

Normal? Worry? Tips to up his weight?