現今小朋友的起跑線，愈推愈前。雖然政府並無官方的統計數字，但粗略估算，香港至少有六、七百家早期教育中心，為0-3歲、尚未入讀幼稚園的小朋友提供各類興趣班以及playgroup課程，市場可謂非常龐大。
然而，在各大育兒討論區，卻經常都有家長問道：「孩子是否愈早上Playgroup愈好?」、「playgroup其實有沒有用?」
參考資料
Ames, L. Ilg, F. and Haber, C. (1979), Your One-Year-Old: The Fun-Loving, Fussy 12-to 24-month-old, McGraw-Hill.
Heckman, J. et al.(2010) “Enhancements in Noncognitive Capacities Explain Most of the effects of the Perry Preschool Program”, January 2010.
Currie, J.; Thomas, D. (1995). "Does Head Start Make A Difference?" American Economic Review 85 (3): 341.
Datta, L. (1976). "The impact of the Westinghouse/Ohio evaluation on the development of project Head Start: An examination of the immediate and longer-term effects and how they came about", The Evaluation of Social Programs: 129–181.
Lee, V. E. et al. (1990) "Are Head Start Effects Sustained? A Longitudinal Follow-up Comparison of Disadvantaged Children Attending Head Start, No Preschool, and Other Preschool Programs" Child Development 61 (2): 495–507
Medina, J. (2010) Brain rules: How to raise a smart and happy child from zero to five. Pear Press.
Tough, P. (2012) How children succeed: grit, curiosity and the hidden power of character. McCormick & Williams.
