Chi's Sweet Home Vol 11

From the Vertical edition

Nothing is more heartbreaking to a mother than losing a child. There is nothing that can replace family, and when one is lost at such a tender age it is even more distressing as uncertainty over the child's survival weighs heavily. So if fate offers an opportunity to be reunited with that lost child, it is a mother's duty to seize the moment and hope for a happy family reunion.

Source: Anime News Network Encyclopedia