I'm sorry EnglishFrench Dictionary WordReferencecomI'm apologetic for the little one.
I feel sorry for your child. I know what difficult such a situation can be. I urge you, accept my sincere regrets.
I'm regretful about you. I understand what tough such a situation can be. I kindly request, accept my genuine condolences. I truly regret the trouble brought about. I feel anticipating that your child will forgive me.