I do love all babies and toddlers now, I wasn't interested at all whilst I was a new mother and before that absolutely not at all bored me stupid. So that feeling came quite late for me. However, I don't think the friend's feelings are unusual some people are strange in the way that expect others to be interested in their children/grandchildren
why would they be? For example, some very nice people my husband knew first as clients and then as friends seen very infrequently, send out the most detailed breakdown of what has happened to their children/grandchildren complete with photos in a round Robin letter at Christmas time, it kind of misfires really. Firstly we all have families and experiences problems and joys or whatever that we are living, there's no way I would regale people on our card list, unless they are particularly close, with a breakdown of my year through the prism of the family's year, quite honestly how interested can you be in the minutiae of acquaintance's lives.