ETA: Poster asked for advice from mothers in similar situations. However, because I didn't give the "and we all lived happily every after" story - my advice is discounted. Additionally, the poster didn't state anything about the use of birth control in her original post, so my references to being careless about birth control were totally founded when I posted.
I stand by what I said. The poster knows there is a risk - otherwise she wouldn't have asked the question to begin with. Do some folks drink without consequence to their unborn child? I guess so - again, you can't turn back the clock to see what your child would have been like with zero exposure, so no one can truly answer that question. I didn't see anyone else who IS raising FAS kids chime in - so clearly my side will be in the minority, but it doesn't make it wrong, or even mean - FAS is one of the few disabilities that is literally 100% PREVENTABLE. To point out that drinking during pregnancy puts unborn children at risk is a fact. THERE IS NO KNOWN SAFE AMOUNT OR TIME TO DRINK DURING PREGNANCY. This information comes from doctors of all walks of life, not just my personal "opinion" because I have some axe to grind.
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As an adoptive mother raising 3 children with varying degrees of Fetal Alcohol Syndrome, I have no reassurance to offer you - only anger. You are a sexually active person who was clearly careless about her birth control and your child will be the one to pay the price.
Although alcohol consumption during any part of a pregnancy can cause issues, the most damage done is during the first 3 months of pregnancy. It is not likely that this will be something that can be screened for during the pregnancy itself - as many of the manifestations of FAS will not show up in testing/sonogram/etc. Sadly, many children out there suffer from FAS (or FASD or P-FAS) - but they go undiagnosed because the mother is too vain and selfish to admit to a doctor that she drank during her pregnancy. I mean, if your child shows some of the symptoms when he or she is let's say 5, are you going to tell the school and your child's pediatrician that you drank during your first trimester? Unlikely . . .
I'm sure you will get lots of "oh I drank (or my friend, or my sister, or my cousin, or my neighbor) and MY kid is just FINE." How can you know that? You can't turn back the clock to see what your child's potential would have been had you NOT drank during your pregnancy. Some of the symptoms of FAS are quite subtle and often mistaken for other issues or blamed on other things.
So, no, I cannot offer you reassurance . . . I can tell you that my children have suffered greatly from a disorder that is 100% preventable. One is doing "ok" - the FAS is subtle and he will likely live a "normal" life, other than things are just often harder for him in general. One lives at home with us - he is going to be 19 this year, but will never truly be older than 8. He suffers from both mental and physical effects of the FAS. He will move to a group home when he is older and needs lifelong assistance. He was not diagnosed as FAS until he was 7. One is in a facility with round the clock care and is severely affected mentally and emotionally. Although he is developmentally disabled, he tested "bright" at age 4 and was not diagnosed with FAS until his early teens.
"0" Alcohol "4" "9" Months.