Kids wooden educational toy blcoks -EN-71,ASTM F963,ST,ICTI, ... First! 1 year -old children only need to learn the color, big or small,shape and to practice holding and so on, 30 ... 2-3 years old konwing the concept of building , adding 100 pieces for mixed use is okif you get any question ... ,please contact us at your convenience Kids wooden Educational toys building blocks