share content between multiple wordpress sites

Hi guys.

I have a multiple Health related news site.
SOme of them shared info.
one is the main site that feeds the others differently.
How can i share content between these sites,
is there a way to share the same database between different wordpress site, maybe if i create subdomains for each child website.
All these site will use word press, currently i have designed the main site.

Please help,
any ideas.

best