After my 20 week ultrasound there were concerns about baby measuring small. Limbs (sorry, I don t recall the exact term) were in the 4th and 5th percentile, HC was 11th, and BPD was measuring in the 1st percentile. I was sent for a follow up ultrasound at 26 weeks. The numbers improved slightly with the limbs in the 8th and 9th percentile, HC was 18th, and BPD was at 4. My doctor is concerned, particularly with the BPD and has sent me for some tests and is referring me to a specialist. He also said I ll have more ultrasounds to monitor. Im looking for thoughts on what this could be. I just want to be prepared when I do get results back. I would rather worry over nothing than not be worried and have it turn out serious.