Cardi B just posted the first public pictures of her newborn baby.

The photos, captioned with the date Nov. 4, have also raised speculation she could be engaged because of the huge rock on her finger. TMZ has confirmed, however, it is NOT an engagement ring.

As you know ... the newborn baby boy marks her first baby NFL star Stefon Diggs . Getty

The new addition will join Cardi's previous 3 children -- Kulture , Blossom, and Wave -- with ex Offset , and Stefon's daughter, Nova , from a previous relationship.

We're told Stefon, the New England Patriots star receiver, was with Cardi when their baby boy arrived. Getty

Cardi initially announced the birth last week in a social media post. Getty

She wrote ... "My life has always been a combination of dif

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