Many kids receive baby banks when born. When they are old enough to understand you can empty them, teaching them to count money will be the first way to learn. Opening a Savings Account and letting them take it to the bank giving them their Saving book will always stay with them.
When this is done have them start over with the bank and when it is filled each time let them take the Saving book and put it in the bank. This will teach kids to save and if you do it until they are grown this will be a good start for them to have in life, maybe for down payment of their first house, etc.