Benedict Cumberbatch has praised his wife for being a great mother saying their son is her ''biggest achievement''.

The 40-year-old actor is in awe of his 38-year-old spouse Sophie Hunter's parenting skills when it comes to caring for their 16-month-old son Christopher and admits he is still learning when it comes to being a dad.

In an interview with UK TV show 'This Morning', Benedict - who is expecting his second baby with Sophie - said: ''It's Sophie's biggest achievement. I'm still trying to prove myself as a dad. We're expecting our second. I'm very excited. I'll be there all the way, absolutely.''

Benedict can currently be seen in new Marvel movie 'Doctor Strange' in which he plays the titular magical superhero.

The 'Sherlock' star gets his shirt off for some scenes in the film but isn't thinking about earning even more adoring female fans from his superhero role.

He laughed: ''I don't really spend too much time thinking about it (being a pin-up). I was very, very lucky to have great, really skilled makeup artists create the look.''