“Postpartum moms everywhere” are “thanking” Kourtney Kardashian for her latest social media post. The reality star welcomed her fourth child last November with Blink-182’s Travis Barker. Her three children with Scott Disick, Penelope, Reign, and Mason Disick, now have a little brother named Rocky Barker. This May, Kourtney Kardashian reveals how her postpartum journey comes with a “changing mindset.” As the all-new season of The Kardashians approaches, Kourtney shares some behind-the-scenes snaps of filming. The 45-year-old reflects on what it was like swapping out her pajamas for high heels a…