Kylie Jenner. Picture: Instagram

Kylie Jenner is "focusing" on getting her pre-pregnancy body back as she wants to be at a more "comfortable weight".

Following the arrival of baby Stormi last month, the 'Keeping Up With The Kardashians' star has been working out to get herself to a more "comfortable weight". 

READ: Kylie Jenner thought she was having a boy

A source told People magazine: "Kylie is already starting to work out. She's focusing on getting her body back and also getting back to a comfortable weight aside from caring for Stormi. 

She wasn't the most comfortable while pregnant. 

She's super determined to get back to her pre-pregnancy body. Kylie wants to be a really hot young mom and is making sure that happens. She'll be flaunting her progress more and more."

Meanwhile, Kylie's sister Kendall previously revealed she has grown closer to her sister Kylie because of the arrival of baby Stormi.

She said: "It's not that it's more exciting than any other births in the family - it's different exciting, because she's my baby sister who I grew up with. We all grew up in twos: Kourtney and Kim grew up together; Rob and Khloé; Brandon and Brody; Burton and Casey, and then Kylie and I. So to see my best friend growing up have a baby? It's already made us even closer."

And a source previously claimed Kylie has strict rules on who can visit her and her daughter.

The insider shared: "You have to go to her house to visit. She's being very careful about keeping the baby healthy and indoors."

And Kris Jenner - Kylie's mom - is convinced her daughter was "born to have children".

Speaking about Stormi - who Kylie has with her partner Travis Scott - she shared: "She's doing really, really great! The baby's happy and healthy! I think she was just born to have kids. I felt like I was the same way. I wanted to have a baby when I was 16 years old. I thought about how many kids I would have. So I think that some people are just ... when you know, you know."