As an extreme case, some parents get so stressed and chronically sleep deprived that they get frustrated at their babies for continually crying and shake them, leading to permanent brain damage and even death.[0] To be clear, these parents don't mean to hurt their child but they're not operating coherently anymore. A robot that can give parents a breather here and there would significantly improve quality of care for soooo many babies.

[0] https://www.mayoclinic.org/diseases-conditions/shaken-baby-s...