How the one-year-old is more capable than the infant but seldom easier to live with. The last volume is an unexciting series, this shares the features of other Ames-Ilg collaborations: strong on specific details, less persuasive in its basic assumptions. The authors well know, for example, that the one-year-old inverts his spoon when feeding himself or may, for a while, benefit from standing up during meals when the gross motor drive intensifies. They are familiar with moody periods--grandparents may get the brush-off for a month or two--and the single behaviors that appear without warning, upsetting routines or relationships: refusal to take a bath or a tendency to bite when angered. But Ames and Ilg suggest some solutions no longer broadly acceptable (harnesses, playpens at 15 months) and rely for discussions of personality on Sheldon's ""constitutional psychology""--behavior as a function of body type. This perspective is limited and their discussion omits the contributions of other important child development researchers including White, Kagan, and Mahler. Consistent with previous volumes, this offers good anecdotal descriptions of behavior and some consolations for mums, but not enough to help organize the larger picture.