"Today is my dad's birthday," the Keeping Up With the Kardashians star, 35, wrote on her app. "I know there's nothing more in the world he would have wanted than to meet his grandchildren. So I wanted to share this pic of Saint with you all."
The beautiful photo shows Saint sleeping peacefully with his tiny fists balled and his arms outstretched.
Kardashian and her husband, Kanye West, welcomed their second child on December 5. While this isn't the first photo that Kim has shared of her son, it's the one were we can clearly see his face.