I feel regretful for the little one.
I'm apologetic about your child. I know how challenging such a situation might seem. I kindly request, accept my sincere apologies.
I feel apologetic about the little one. I know what difficult the situation might seem. I kindly request, take my sincere apologies. I truly feel remorseful for the inconvenience brought about. I feel expecting that the little one will pardon me.

Translation of sorry little one in French Reverso Context