Baby formula is limited?

A sign stuck to the self-servce checkouts in Woolworths:
Baby Formula limit of (4) per customer
Is there a shortage? Can you get high from baby formula? Ideas on a postcard folks.
Since 2010

A sign stuck to the self-servce checkouts in Woolworths:
Baby Formula limit of (4) per customer
Is there a shortage? Can you get high from baby formula? Ideas on a postcard folks.