Hi Yael
I can understand that you would want to do what you can to avoid exzema for your little one... and without trials it would be hard for them to make significant progess wouldnt it???
I think you should ask your OB and Dermatologist about it and go with their recommendation - agree with you that even 'natural' things can be problematic so good to get their opinion and also to be informed fully yourself so you dont have any regrets down the track.
Good luck with it.