Or do they always have that "look". I only ask cuz when my baby smiles she sort of has that look....but otherwise looks normal. Or is it all or nothing with downs?
Most cases are diagnosed at birth because most all DS babies have unique characteristics that make then stand out, one being very small ears. Given your sons age, I doubt a late diagnosis could go unnoticed.
@Mijita its my daughter that I'm wondering about she's 7 months and ya I realize it is probably very unlikely but I just noticed her smile has changed and she kinda has that look
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That is one of the reasons 3d ultrasounds can be medically necessary by insurance- it is able to detect down's syndrome by the features.
My niece, Daisi looked that way growing up. It's highly unlikely because they woulda have noticed many markers and/or some sort of congenital defect.
http://m.voices.yahoo.com/down-syndrome-information-characteristics-down-55099.html
This is just to show you what I mean. You can always check out a down syndrome foundation website for more info. However, it is highly unlikely DS.