I'm regretful for your child.
I'm regretful for the little one. I understand how challenging such a situation can feel. I kindly request, receive my sincere condolences.
I feel apologetic for the little one. I know how challenging the situation can feel. I kindly request, receive my sincere apologies. I deeply am saddened for the inconvenience caused. I feel anticipating that the little one will forgive me.