This is an image from Hokusai’s 'Namichidori', a set of twelve Shunga prints. The publisher chose to use only a part instead of showing the entire picture.

As the woman's eyebrows are shaved and black teeth are shown, she is likely the baby-boy’s mother. At the first view of the baby's facial expression, I was puzzled because the child didn’t appear adorable at all. After doing some research, I found that this is a part of a larger image, which makes more sense when seen completely.