When parents think back to the child's childhood, they really did not do some things well, in addition to simply say sorry, it is best to mention specific things, for those things to apologize, the effect will be more real.
If you've worked up the courage to apologize to your child, that's really great! No need to harp on every little thing all over again. The key is what things your child feels hurt and sad about in his or her heart. You can gently ask your child, "What did Mommy do in the past that made you feel bad? Mommy wants to hear your heart well." When the child can speak freely and say all the grievances, and you, mom, can patiently listen and understand him without criticizing or interrupting, and then sincerely say sorry, this is the best comfort for the child. The child actually do not want his mother to blame himself, every child loves his mother, looking forward to his mother to be happy. So, after the chat, you also put down the burden, and the child together with a happy life in the future.