When I visited Dutch friends of mine after she gave birth last year they had a traditional food that is given to guests who visit - a kind of a hard bread/cracker (forgot the name sorry!) with an aniseed spread. It was quite sweet and yummy actually - and I loved that I was experiencing something from a different culture. Apparently the aniseed is supposed to help the mother's milk (she's supposed to eat some with the guests).

I haven't heard of anything else like this though. But then, I haven't visited that many people from different backgrounds having babies.