I did read what you said.
"kelly, you have an agenda, but sadly little knowledge.
Drugs are researched from the point of view of doing harm.....
The specialist you urge the OP to speak to may have a view and of course should be consulted. But he/she may not be an expert in pharmacological interactions with breastfeeding and babies. The manufacturers have a cover-your-ass approach, which may well mean they advise 'no' with no real evidence. The drug regulatory agency in the UK is here: www.mhra.gov.uk. They look after licensing - I doubt they would take individual queries from the public, but in any case, sertraline is a licensed medication and it would be up to the prescriber to discuss its use with the patient (in this case, the OP).
The OP can look at reputable websites and other sources and take advice - and then decide."
You gave information about the safety of sertraline in your first post. You did not mention that this was related to your own experience of using sertraline, contrary to what other posters who have advised the OP have done.
There is no "fevered imagination" (what hyperbole!) on kelly's part or on mine. In general, when dealing with specialist areas such as perinatal mental health, consulting a specialist health care provider who is aware of your circumstance and medical history is to be preferred to looking at websites, however reputable, though these may have a place in decision-making which is why we all use and consult them.
Individual anecdotes are often comforting and reassuring, but links and quotes in the absence of individual information about a patient's history/presentation etc about medical safety can be misleading. If the OP is dealing with a perinatal mental health specialist, there is no reason to believe that they are not very well educated in pharmacological interactions with breastfeeding, pregnancy and babies. If the OP is unhappy with their advice, having done some independent research and/or going with gut instinct/advice from others, they can request a second opinion, however it doesn't make sense to me to believe that they wouldn't be more informed than someone on a website who has not given any background or credentials to suggest otherwise.
I'm not really sure why you are saying things like "oh for goodness sake" etc
. It's really not very controversial to suggest that the OP should consult reputable sources and their individual healthcare provider as well as looking online, and I didn't see any evidence of any "agenda" in this suggestion. It is simple common sense when it comes to something as serious as maternal mental health. Most areas, thankfully, have good care pathways for perinatal mental health now and this would be my first point of investigation.