The day after big sister Kourtney, 30, gave birth to her first child with beau Scott Disick, Kardashian hit one of L.A.'s trendiest shops – Intuition – for Baby Eggi clothing.
"She was super excited about her nephew and loved that she could scoop up some cool stuff for him!" says a source.
Kardashian loved a "peace" hoodie, designed by celeb tattoo artist Mark Mahoney, specifically because "she thought the design was really unique and unlike anything out there," says the source. "And she thought the days of the week onsies were just adorable and something that Kourtney would love and could really use."
The reality star recently wrote on her blog that Mason was "the perfect gift this Christmas." "The whole family is so thrilled, excited and blessed," she said.