Hi
It is so hard isn't it. My daughter had multiple critical allergies. dairy, egg, wheat (not gluten) , soya, beef, sesame, pulses, banana. oddly fine with nuts! She reacted noticeably through my breast milk. So I excluded all of them until I stopped feeding when she was 3.5. It is perfectly possible. But a challenge to begin with.
I have been involved with a few different forums. There are mums who find a real difference after exclusion and others who don't. I know of other severely allergic babies who didn't react at all through bm. So it does seem to be luck of the draw.
I would advise you to keep a detailed diary of what you both eat, skin, sleep and nappies to see if there is any pattern.
It can take a number of weeks. some say 6 before all traces are out of your system. I saw improvements very quickly though.
Many babies who cannot tolerate dairy are also unable to tolerate soya so try not to introduce lots of soya products into your diet as this could prevent any improvement.
my daughters eczema was directly caused by her allergies. She was covered head to foot within days of anaphylactic shock caused by formula touching her lip.
She needed steroids and emollients along side a restricted diet to help her skin.
We tried a number of creams before finding that hydromol suited her. and steroid ointment not cream applied liberally twice a day for 10 days I think it was. If the steroid doesn't touch it you need a stronger one.
My daughter is 5 now. Has an epipen for sesame but can eat everything else. It has been a long slog of food challenges.
Please read labels carefully. Avoid everything with any milk product in for the first few weeks. You can then slowly add things into your diet whilst carefully recording reactions. This will help develop her tolerance too.
Best of luck and feel free to message me if I can be of any help