I think you can gently offer suggestions which do not sound like your opinion or advice. I don't have a bub yet but I already know I will hate it when people try to tell me I shoudln't have bubs in my room or I should get them in a sleeping pattern in their own room or 'babies just cry, you don't always have to run to them'. Essentially if you say something you are doing the exact same thing with your views and your friend may not appreciate it iykmwi. Maybe suggest that your mothers group each read a book every month and than bring it in to the next gathering and if anyone wants to borrow it they can... That way your book will be there and if any of the mums 'are' interested they can borrow it