What do polar bear cubs eat?

polar bear cubs get milk from their mom.
Polar bear cubs are nursed by their mother for 2-2.5 years. This means that their diet is made up of milk.

When they are weaned, their diet becomes very similar to adult polar bears - they eat mainly seals. Sub-adults may be forced to feed on the left-over carcasses of older bears if they are to young to kill their own.