Ok then you will need to explain to mom how you got him to the point he is at but also remind her that it will be worse but that she has to stay firm and remember that she is doing this for the sake of her new baby who will have needs and for the oldest so he will be able to cope. As long as she thinks it is for the kids' sake and not hers she will be able to last longer. A lot of what we do in daycae is a modified Ferber technique where we keep reassuring the child and spreading out the contact to allow the child the time needed to take care of their own needs -ie put themselves to sleep, feed themselves, play without adult hovering, whatever. If mom is asking for help then by all means offer her what you can. For tips it is the fact that the problem didn't happen overnight and is not going to be solved overnight. That you had success because you started a different method. That the same method will work over time if she is consistent and realizes that no matter how much the child protests and cries, whines, tantrums, whatever that it is a learning phase he needs to go through and that everyone will be better for it out the other side. Self confidence and self esteem is so important even for infants and adults take away that right way too often by assuming the child can't cope without them. Give kids more credit and realize there is a difference between need and want. It's hard sometimes to help a parent when we can see why we dont' have the same issues but that it means telling the parent to do something differently.