Should i insist on another ultrasound? baby was around 25the percent size.

Yes!: Repeat ultrasound during pregnancy is an absolute necessity, especially if there is a problem w/ fetal development. Us is the most reliable way to follow fetal development, response to treatment, etc.

Open dialogue: In a good open relationship with your OB you shouldn't have to insist on anything. If s/he is anything like the ob's i work with they would prefer for you to openly share any concern you have & are likely to do another ( spaced a bit to see if the growth is consistent) even without your request. If you raise a concern they would share the issue of timing & information they get from each study.

Agree with Dr. F: I'm sure your OB has offered you all the latest tests for chromosomal abnormalities because of the increased risk at your age & is monitoring your pregnancy closely. On growth charts & standardized tests, 25th%ile-75th%ile is the average range; 50th%ile is the mean. So, if length, weight & head circumference are growing along the 25th%ile, that's normal. The velocity of growth is what's important.