Both the baby and the actress are "safe and healthy," Saif, 50, said in a statement, as reported in foreign media reports.
"We have been blessed with a baby boy. Mom and baby are safe and healthy. Thank you to our well-wishers for their love and support," the actor said in a statement.
Kareena was admitted to Mumbai's Breach Candy Hospital early Sunday morning and her baby was born around 9 am, her father, veteran actor Randhir Kapoor, informed.
"She has delivered a baby boy in the morning around 9 am," he told.
Their firstborn Taimur Ali Khan was born on December 20, 2016.
Kareena Kapoor's sister Karisma expressed her happiness of becoming a maasi again on social media by sharing a throwback photo and a note that read: "That's my sis when she was a newborn and now she's a mama once again! And I'm a maasi again, so excited. #goodwishes #congratulations #onlylove."
Kareena and Saif, parents to four-year-old Taimur, announced their second pregnancy in August 2020. "We are very pleased to announce that we are expecting an addition to our family. Thank you to all our well-wishers for all their love and support," the couple said in a joint statement. Kareena and Saif, co-stars of films like Tashan and Omkara, married in 2012; Taimur was born in 2016.
Saif Ali Khan has two older children with first wife Amrita Singh - Sara, an actress like her parents, and Ibrahim.
Karisma shared the joy of becoming a "maasi again" on Instagram by posting this throwback picture of Kareena Kapoor from when she was a little baby