This bit seems strange to me. If you need a dating scan done, why wait until 12 weeks? It's more accurate earlier on - the difference in DS between 8 and 12 weeks was significant. And if you need a dating scan because you don't know your dates, and you do want the nt part done, then worrying until you think you're 12 weeks could mean you miss the window of getting the right measurement. If you know your dates and don't need a dating scan, and don't want the NT bit done, then why do the 12 week one at all?
For us, we only had two scans with DD - 12 and 20 weeks. With DS we had the dating scan because he was a bit unexpected and AF had only been back twice and was abnormal, then the NT scan, anatomy scan at 20 weeks and an extra one at either 32 or 34 weeks I think, just because he was measuring so huge. I nearly didn't do that one.
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