The montage system is definitely the easiest way to deal with the constant motion of babies and it was great for the book, as all the different angles gave me loads of observations to talk about.
Things might be a bit thin on the ground for younger ones, but I have plenty of examples at the other end of the scale - I just love drawing older faces. So much character. As we age we get more and more individual.
Fortunately, there are some constants to watch for when you're drawing older people, like the tiny, vertical creases we women get above our top lip, the deepening shadow between eye and nose, the loose neck... oh goodness, I've got to stop - it's all too depressing!!