I feel apologetic for the little one.
I feel apologetic for your child. I understand how difficult this situation might seem. I urge you, receive my heartfelt condolences.
I am regretful about the little one. I understand what challenging such a situation can be. I kindly request, accept my genuine condolences. I genuinely feel remorseful for the upset brought about. I'm anticipating that your child will pardon me.