Season 3 of Sherlock additionally saw the introduction of Mary Morstan (Amanda Abbington), who will return alongside Sherlock and John in season 4.
Following the famous detective created by Sir Arthur Conan Doyle, Sherlock Holmes (Benedict Cumberbatch), and his partner in deduction Dr. John Watson (Martin Freeman), Sherlock has balanced elements of the classic character with modern updates.
It’s tough to glean much else from the photo given that the wee Watson is merely hanging from a baby carrier strapped to John.
Whether or not baby Watson will at any point be under peril remains to be seen.