I am a firm believer in starting good habits as early as possible. This should especially apply to starting the habits of living a godly life. One of the easiest, most enjoyable godly habits to start with your child is teaching them to serve others.
Our daughter was just over a year old when she actively participated in her first service project. Our church had collected cans of food to take to another congregation in town who served the poor in our city from their building. Our daughter would take cans of food off the shelves and put them in the bags or boxes we were taking downtown. At other times she would reverse the project and take cans people had donated and place them on the lower shelves. She was also able to hand them to me to place on higher shelves.