Robert Downey Jr. can't wait to go shopping for his baby daughter

Speaking at Comic-Con in San Diego, he said: "I haven't had much time to shop for her yet, but when I do it's going to be a blizzard."

Downey isn't the only 'Avengers: Age of Ultron' cast member- who has sons Indio, 20, with ex-wife Deborah Falconer, and Exton, two, with Susan - to be expecting a baby as his co-star Scarlett Johansson and her fiance Romain Dauriac will welcome their first child into the world in the coming months, and the actor thinks she will be a "great" mom.

Asked what sort of mother he thinks Scarlett will be, he told E! News: "She's great, I know she'll be a great mom."

The 'Iron Man' star recently admitted he is apprehensive about having a daughter having only raised sons in the past.

He said: "I've never had a daughter before, so I don't know what really prepares a dad. I'm asking around. But I did my part and now I'm just going to show up and do what I'm told.''