Reality TV star Kim Kardashian has stepped out for the first time since giving birth to son Saint West.

Just a day following her first appearance in a four-minute live stream on her app and website, the mother of two took her newborn son for a trip to a building here on Friday. It appeared to be a doctor's office, reports eonline.com.

Kim and Saint were joined by Kanye West and the couple's first child North West.

The 35-year-old reality TV star held North while her husband was in charge of carrying Saint in the baby carrier.

Kim sported an all-black outfit topped with an oversized coat which concealed her post-baby body.

She styled her long hair in braids and sucked a lollipop. Kanye, meanwhile, was clad in a black hoodie and matching boots.

"The family seemed happy and upbeat. Kim looked great," a source said about the family's outing.