Olivia Wilde's baby son is "really musical."

She beamed: "He's so smart and just plays his piano all day long. He's really musical so we're trying to encourage that."

The 30-year-old actress is currently in the process of promoting her new movie 'The Lazarus Effect, which hit screens today (27.02.15), and she's worried she'll miss Otis taking his first steps while she's tied up with work commitments.

She explained: "He's about to walk. He's teetering and I just don't want him to do it while I'm at work."

Meanwhile, the brunette beauty's priorities have shifted since she became a mother last April and she insists she'll be more careful when she takes on work projects from now on.

She said previously: "It takes a fun project to make it worth leaving home. So maybe your standards get a little higher.

"Your priorities change too because you think, 'Well, I want to make something my kid will watch. Jason is making 'Angry Birds' and I'm really happy about that because it's probably the first movie of either of ours that Otis will be able to watch."