“Agastya's birthday. Enters his 'teen'. Here to wish him,” Amitabh posted Saturday night on srbachchan.tumblr.com.
While his grandson was covered in a hood, Amitabh was spotted in casuals with a jacket on.
Saturday early morning, he had posted: "He (Agastya) was just born the other day and we were all rushing from different parts of the country to the Breach Candy Hospital for the delivery.”