baby growth

on 17 jan my usg shows i am 6 weeks 4 days preg,my lmp was on 24 nov,2009,my usg report says,
A WELL DEFINED FUNDAL GESTATIONAL SAC WITH A SINGLE VIABLE DEVELOPING EMBRYO INSIDE OF 6 WEEKS 4 DAYS MATURITY SEEN AS ASSESSED BY CROWN-RUMP LENGTH (C.R.L. ) OF 6.3 MM.EMBRYO CARDIAC ACTIVITY IS WELL DETECTED IN BOTH REAL-TIME SCAN AND DUPLEX DOPPLER WHICH IS AROUND 121 B/M.SECONDARY YOLK SAC IS SEEN ADJACENT TO EMBRYO.CERVIX APPEARS NORMAL IN SHAPE WITH ENDOCERVICAL CANAL DIAMETER OF 3.0 MM.
my doctor is saying that the baby's growth is slow by 10%,is that really slow?my menstrual cycle is usually longer,of 33 to 35 days long,is this really a problem?when my child will born will he /she will born all right and healthy?

[Elaine Brown, MD]

Hi!
Your ultrasound report looks lovely!  I do suspect that your long cycles have something to do with the lag in growth.  If you ovulate a week late, that would make your measurements off by a week.  There is also a built in error in the ultrasound of 4-7 days.  So, if you have another scan, you will probably be told another due date.
I can't say what will happen in the future of course, but if you were my patient, I would advise you that there is about a 90% chance that you will take home a baby!
Congrats!
Dr B