January Jones admits being a working single mother is ''difficult''.

The 34-year-old 'Mad Men' actress - who has never revealed the identity of seven-month old Xander's dad - didn't have time to take maternity leave because filming resumed on the show following a 17-month hiatus.

But thankfully she's had no shortage of help from the 'Mad Men' team.

She said: ''I was back [at work] when the baby was only six or seven weeks old so it was difficult.

''It was difficult to be a working mom and just juggling all of that. But everyone made it work and it was great.

''They made it baby friendly for me, because I'm the first female on set to have a baby so I got to bring him. He had his own room and I was able to work around it because I was nursing.''

January believes one of the many perks of motherhood is having someone to find you funny.

Talking to US Weekly, she explained: ''He is eating solids and he is just jabbering away. He's becoming more of a little person. He is quite a charmer!

''I love to make him laugh. He thinks I'm funny and that's always a nice feeling.''

Her co-star Jon Hamm is just as smitten with the little one. He added: ''He is a lovely lad and he is as cute as a button!''