Reference:
Lally, J.R., Griffen, A., Fenichel, E., Segal, M.M., Stokes Szanton, E., & Weisbound, B. (1995). Developmental Milestones of Children from Birth to Age 3. Caring For Infants and Toddlers in Groups: Developmentally Appropriate Practice (pp. 78-79). Washington, DC: Zero to Three. |