“Baby kisses are the best things in the world…I’m so thankful for my sweet angel. He makes my life better in every way! #SoInLove #MomLife #Slobber,” Underwood, 32, captioned the video.
The Grammy winner recently spoke to PEOPLE about how she’s figuring out motherhood one step at a time.
But no matter how unprepared she felt for marriage and motherhood, Underwood is now head over heels in love with both roles — and both of her boys.
“I never dreamt of my wedding day and the perfect guy,” she said. “Then I met Mike, and I was like, ‘Wow, so now I know what I was missing.’ And the same with my son. I was never like, ‘I want kids so bad.’ And now that I have Isaiah in my life, I’m like, ‘What did I do before?’ “
— Andrea Park