Madonna's Daughter Today's Beach Menu ... Cakes & Sandwiches

4/10/2017 2:08 PM PDT

Madonna's daughter, Lourdes Leon, gave new meaning to the phrase ... suns out, buns out when she hit South Beach ... with her appetite.

Madge's 20-year-old not-so-baby girl slipped into a bikini -- showing off what her mama gave her -- and also made sure to take a food break.

Lourdes absolutely inhaled a sandwich out on the beach. See, don't worry Mom ... she's eating.

And looking very healthy.