Wide angle lens tend to make faces more "chubby" than they appear otherwise, and are therefore not used often for portraits, unless the landscape is an important part of the frame.
I'm curious as to whether this "rule" applies to portraits of children and babies as well, since I can imagine a certain amount of "chubbiness" might be more acceptable on children's faces than on adults. Do portrait photographers ever use wide or ultra-wide angle lenses as a main lens for children portraiture, or are long focal lengths the better choice?