Small Fetal Stomach

I am 37 weeks and 6 days along in my pregnancy.  At 33 weeks, I was sent for a check up ultrasound, since my first born was diagnosed with hydrocephalus, after birth.  Up until 33 weeks, I was told everything was progressing beautifully.  At 33 weeks, I was told that this baby has a small stomach.  I have been sent twice a week for NST and ambiotic fluid checks.  Each time, the baby has passed.  Her heartbeat is typically at 135 at rest and will rise to 160 with movement or response to the environment.  The baby's activity has maintained.  At least week's growth scan, the doctor said her stomach was still measuring small.  They recommended I be induced at week 38.  My doctor told me (not the specialist) that her stomach size was in the 10th percentile.  She was currently weighing 5 pounds 11 oz at 37 weeks 1 day. I have been told that all other measurements are either on target or near target, nothing is showing an oversize of her body.  My doctor does not seem overly concerned.  Should I be?  

[Yao Sun, MD, PhD]

If the smaller stomach is an isolated finding, there might be nothing wrong since the amount of fluid a baby has in the stomach can vary during the pregnancy.  Obstruction of the esophagus or gastrointestinal tract is often associated with other findings such as increased amniotic fluid or other anatomic abnormalities.