I have a real dilemma and need some advice, for obvious reasons I have name changed for this.
I have a friend who has just had a baby. I don't feel she has ever been really bothered about becoming a mum, kind of "if it happens it happens" but I don't feel she would have been devastated if it had never happened. I feel she went along with it more for her DH who was desperate to become a Dad.
Historically friend has had a very bad relationship with alcohol, she drank every day and on every social occasion would get carried away leading to obvious arguments between her and her DH. There have been countless times when she has behaved terribly and been a laughing stock of parties/holidays and it became almost part of her character. She almost embraced it.
I was concerned when she announced she was pregnant because I never considered her drinking to be much of a choice but an addiction and having had a mother with alcohol issues I know it's not a matter of just "stopping" with an addiction. I remember saying to DH "I bet her DH is relieved that's 9 months of no booze" and DH looking at me as if I was mad.
The pregnancy started off quite well with her not drinking or drinking alcohol free drinks - quite early on in the pregnancy she confided in my she was actually quite enjoying the non drinking and had conceded the drinking had got "out of hand" and had become "quite an issue" between her and husband, I was relieved and really tried to encourage her, when we would meet up I would abstain to try and support her but as time went on the drinks crept in. I had noticed she would end up basically sharing her DH's beer at lunch or whatever and my DH had made the odd comment to me about old habits dying hard etc but I felt weirdly defensive of her and always stuck up for her in front of others, I'm not sure why because I know it was wrong. She was never drunk but I had reasons to suspect she was drinking more than she was letting on and later my suspicions were confirmed when she confided in me that her and her DH had had some huge arguments about drinking while pregnant, not helped by the fact that he had also found out she had smoked a bit. 
Fast forward to the birth, she is breast feeding very well but we went to visit when the baby was one week old and she basically drank at least half a bottle of champagne just while we were there. As we were leaving another friend turned up and she said to the friends that had arrived, "there's a bottle of champers in the fridge with our name on it." This weekend we popped in again unannounced and she was enjoying more wine with other friends. I know she met up with another friend yesterday and had at least two glasses of wine, that friend phoned me last night to share their concerns. I know she will be drinking more in the evenings too and what we and others are seeing is merely the tip of the iceberg. I feel so desperately worried about the baby and how my friend will manage when her DH goes back to work next week and when the real tiredness kicks in I'm worried she'll secretly drink or drink in the day.
What do I do? How do I broach the subject? On the one hand I know I need to say something as I am desperately worried about my friend and the little baby but on the other, is it just asking for trouble? Is it even my place? I don't know what to do for the best but last night I couldn't sleep for thinking of the little baby and wondering if he's getting a series of little hangovers, he does seem so restless on the occasions I have seen him but I do appreciate this can be due to a multitude of reasons.
I do just want to say I am by no means being a busybody and I do know you can have the odd drink and breast feed but I know in my heart that's not what's happening here. I've even contemplated phoning the midwife anonymously but I'm worried it will come out it was me. Should I say something to her DH? Do I just make a couple of well placed comments. I am very early on in my 2nd pregnancy (no one knows as yet) and probably overly emotional but I can't stop thinking about it. I do so love my friend, and want to help her but don't want to come across as judgey pants but I suppose I just writing this I am judging her. She's an intelligent woman and I know she knows this is wrong....I can't understand why she won't FF the baby but as DH said, maybe there will be nothing to stop her then...
I'm sorry this has turned into an essay, any thoughts or advice would be really appreciated.