Normal colored Mille Fleurs? -the Store will list the Breeds that they ordered. Each Bantam breed is available in only certain colors. Knowing the breed will help identify the Porcelain for sure. Porcelains are not common and you will love yours!. With the "beard" and feathered legs, yours are surely Belgian Bearded d'Uccle Bantams. They are bred in 10 accepted colors in the US, and each variety is bred carefully--not crossed with other colors, even in d'Uccles, without knowing the ones that will not produce mongrel colors.
I raise two Dutch Bantam Mille Fleur colors--Mille Fleur and Cream Mille Fleur. It is possible to raise Blue Mille Fleur in Dutch. but they are not very distinct and less desireable. Expect your babies will be beautiful when feathered!
I have a book BELGIAN BANTAMS, by Veronica Mayhew. Although my Mille Fleur bantams are Dutch not Belgians, there is little to study how to breed the Mille Fleur colors, and it has been very useful to learn the genetics and choosing the best birds to use for breeding the pattern correctly. It becomes a really long term project, with lots of pleasure! Enjoy yours!