I can't seem to find anything to verify your 10% claim - all I can find is stats showing that child poverty actually went down.. Are you able to post a source for that?

EDIT: since my account has been rate-limited... The msn article below was released before the stats and is purely speculation. The stats before covid already indicate an increase, and NZ has long had fluctuating child poverty rates, which the current government is attempting to address. However it is essential to realise that this increase is largely driven by the effects of the previous government, and the housing and rental market - not the effects of Covid-19. https://www.cpag.org.nz/the-latest/current-statistics/latest...