Welcome Jinx...I'm going to have to agree with all the other girls - scans for dating purposes in second tri are not particularly accurate. My sonographer explained to me that the dates that the machine automoatically calculates are based on 'averages' - and there is a certain amount of leeway either side of the 'smack-bang-in-the-middle-average' that is considered normal. The difference in size among individual babies increase as their gestational age increases.
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