Kopp, Claire B. Baby steps : the "whys" of your child's behavior in the first two years / by Claire B. Kopp with the assistance of Donna L. Bean - New York : W. H. Freeman, 1994 - 279 p. : ill. ; 24 cm. ISBN: 0716724995 RM47.53 LCCN: 93-010365 Subjects--Topical Terms: Infant psychologyInfants--DevelopmentChild rearing