I feel regretful for you.
I'm regretful for the little one. I
understand how challenging this situation might seem. I kindly request, accept my sincere regrets.
I'm apologetic about your child. I know what tough such a situation can be. I kindly request, accept my heartfelt regrets. I
genuinely feel remorseful for the inconvenience caused. I feel anticipating that the little one will forgive me.