Care should be taken to give children worksheets that they are capable of doing. This involves understanding and monitoring the child continually, since the level of attainment of different children would often be quite different. The worksheet should challenge the child but not overwhelm her. If the worksheet is too easy or too repetitive, it may bore the child and she would not be happy. If the activity is too difficult it would frustrate her and she would not like to take up more sheets. The children should love to do the worksheets; they should not be thrust upon them. Also doing only worksheets alone repeatedly would not be very productive. You should have a range of physical games and activities as well that would reinforce the concepts learnt.
Truly, your little cute child has all the capacity to learn virtually anything while he is yet innocent-looking infant. According to researches, children who were trained and developed during these informative years proved to be more alert and more active in school than those who were not. Im not saying that if you dont train your child during these early years will totally be a failure. No child is born a genius, and none is born a fool. Other children have inherited skills and talents from their parents that contribute to their confidence as they grow up. Others too who were not pre-schooled can learn things easily. But theres a big difference in stimulating the childs brain during their early years than not at all. See below: