Well, looks like Cardi B has learned the first lesson of parenthood -- it's tough!

The new mom, with Migos hubby Offset, took to Instagram to let fans know that she will not be hitting the road with Bruno Mars this fall. Citing both her doctor's advice and her own physical ability to be on tour, the "I Like It" rapper posted this:

I hope you guys understand .This have been such a hard decision .I want to thank @brunomars for understanding .

A post shared by Cardi B Official IG (@iamcardib) on Jul 26, 2018 at 5:49pm PDT

It's not great news for anyone who had hoped to see Cardi live this fall, but at least those who already have tickets to the 24k Magic tour will be able to hear her!!! Check out what Bruno posted in response:

@iamcardib --

A post shared by Bruno Mars (@brunomars) on Jul 26, 2018 at 6:13pm PDT