Both clad in black, the couple gave no hints as to which team they might have been rooting for.
The Boston Red Sox handed over a bag containing goodies for the baby boy. Harry matched his wife wearing a black Invictus Games polo and black slacks.
The jersey number 19 had little Archie's name printed behind it, and Meghan was bent over laughing when she received it. Which one would you prefer him to wear? They also had meet-and-greet sessions with both teams.
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Royal fans were able to see guests arrive and get a glimpse of each new addition to the royal family.
The service, which is held annually in honour of Her Majesty the Queen's official birthday, saw Meghan join other senior members of royalty for the carriage procession, followed by the famous appearance on the balcony of Buckingham Palace to watch the Royal Air Force perform a fly past. Even though the Duke and Duchess of Sussex were running low on sleep, baby Archie was up all night according to Prince Harry they were all smiles at the event.
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It is likely that they installed a luxury kitchen and bathroom, and it has reportedly been designed by Harry and Meghan with dining and entertaining in mind and with extra bedrooms to accommodate guests, such as the duchess's mother, Doria Ragland.
Prince Harry and Meghan's day at the ballpark also included a reception with former United Kingdom and US Invictus competitors as Harry's Invictus Games Foundation is the charity partner for the MLB London Series.
Before the game started, the Duke and Duchess walked onto the pitch in front of approximately 60,000 baseball fans. "We were pleased to have them in the clubhouse".
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Harry has previously said it is a "tricky balancing act" between his private life and royal duties.