I got my anatomy scan for both my pregnancies at 18weeks.
Not sure what they mean by small for time though.
To find out sex they do it between 18 and 22 weeks and I was told from an ultrasound tech.
Well they said that it will be at 18 weeks because that's when my insurance covers it :/ thet also said that the dr won't tell me what I'm having unless he's In a good mood. So that's why I'm debating if I should go get a 4d scan so I could know already :/
Not sure but I don't know why they're giving you the anatomy at 18, it should be at least 20 weeks to get accurate results. And if you are a little earlier like they said then you might not be able to know gender :/