I think I started a thread about this a few months ago. We also found out at our twenty week scan that we had a SUA, but given that there were no other indicators of foetal abnormalities (I hate that phrase!), there really wasn't anything to worry about. We had a repeat scan at 22 weeks to check the heart and kidney function, and everything looks great.
Our OB originally told us that it was possible that she might be a little on the small side owing to the condition, but I'm 33 weeks now and apparently she's a bit of a giant! Though, I'm a bit skeptical about fundal height and third trimester growth scans as a reliable indicator of size. It's great that you aren't worrying about it - unless it appears in combination with something else, there's no need to, I think! I'm sure your baby will be perfect.
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