Appointment today.

Momof1 • -MommyToRPH

31 weeks & 3 days. Went to my appointment this morning, everything looked good, baby's heartbeat was good. My OB' s only concern is that the baby is almost measuring a week behind. He said that he's not too worried right now, but he will definitely keep an eye on the baby. Has anyone ever measured behind? What causes it? What can I do to help?