So, you’re breastfeeding your baby and now considering a return to IVF (or other forms of assisted conception)? Do you need to wean?
I’ve compiled some info on this – With thanks to some BB members who have provided links and summaries of information they’ve received.

This is a good place to start - Link to the podcasts (it's No.22)

Here’s a summary (courtesy of ~ Mylitta ~)
The main points were:
~ Not all woman HAVE to give up breastfeeding
~ A woman whose menstrual cycle has returned regularly while still breastfeeding may not need to wean
~ Breastfeeding would least affect woman that are having FET's that don't require drugs
~ She went through each drug and talked about how effective it's transmission through breastmilk might be, and how to reduce the amount bubs might get. For example, drugs given by injection are probably given that way because they are less effective as oral drugs, therefore any that gets through the milk would be less effective than via injection, and also that the drug would first go through the baby's digestive system and get broken down more.
~ Most drugs are once daily drugs, so if you breastfed just before taking the drug, then wait as long as possible before feeding again it will lessen the amount in the breastmilk.
~ Many of the drugs used are found in a woman’s body at some stage in their menstrual cycle or pregnancy anyway (although usually at lower levels)
~ We need to balance the benefit of continuing breastfeeding vs the potential risk of the drugs.
Here’s another useful one - Breastfeeding Through Fertility Treatments (IVF and FET) – updated with info on prolactin and implantation (thanks to Entreat & MummaSue)

If you’ve been in this situation or have any other useful info to share, please do! This is an area about which little seems to be known.