Today my wife had a scan and below is the result.

Cephalic presentation.

Fetal heart rate 139bpm regular.

Fetal weight 1010grams.

Placenta is anterior upper segment.

Grade I maturity.

Cervical length is normal, internal OS is closed.

Gestational age by fetal biometry 28wks.

BPD 72mm.     FD 94mm.    HC 265mm.    AC 217mm.   FL 50mm.

But, my main concern is with this "both lateral ventricles are prominent,atrial diameter 9mm on both sides" and suggested a follow up in 2 weeks.

I am worried with this, what is the normal diameter. Could you please provide details on this.