Miss this one. I am pursuing graduate study on childhood, and I found this book to be quite unhelpful. It is an unsystematic, truncated, and poorly written text. Most problematically, it does not at all address the main topic it claims to be about, namely the historical emergence of a sense of interiority in/as a lost childhood. That would make for compelling and important reading if that's what this book were; unfortunately, that's not at all what this book is.
Part of the problem is Steedman's narrow archive; she reads a handful of texts from various domains, but does not sufficiently contextualize them. Furthermore, she does not carry a clear, sustained line of argument throughout the book. Instead, she will occasionally repeat her main claims at the beginnings or ends of chapters, and will then go on to offer several pages of historical detail that do nothing to further her thesis.
This book might be of interest to those who are already deeply immersed in the study of childhood and who already know what small detail they are looking for. But if one is at that stage, one would likely not be seeking out a book that claims to be the kind of broad, historical overview that this one does. Get this from the library to skim if you are already working on a relevant research project; but don't waste your time or money on procuring a copy of this to read in full.