At Windsor Castle, the Duchess of Sussex posed wearing a white sleeveless white trench dress from London-based menswear designer Grace Wales Bonner, a pair of nude-toned Manolo Blahnik pumps and a dainty Jennifer Meyer 18-karat gold necklace.
Prince Harry kept his look GQ-ready with a relaxed fit gray suit and a skinny navy blue tie.
The baby was also pictured resting peacefully with a G.H. Hurt & Son cashmere hat and merino wool shawl from the same brand.
Markle has already spoken highly of her son, saying, "He has the sweetest temperament. He's really calm," prompting Harry to joke beside her, "I wonder who he gets that from."
"He's just been the dream, so it's been a special couple days," added Markle, who was last seen in an official public appearance in March.