The Will McKenzie actor, who appeared alongside Buckley (Jay Cartwright) in the Inbetweeners franchise, said that his former co-star's 2-month old child is "the cutest thing".
"We met the little b**tard the other day and he is a little b**tard, technically," Bird is quoted by The Sun as saying.
"But I can honestly say he's the cutest thing I've ever seen in my life - he's really sweet."
Meanwhile, Bird denied that the baby's name is linked to Inbetweeners star Blake Harrison (Neil Sutherland).
Buckley's fiancée Clair Meek gave birth in October.