The 34-year-old star, who has sons Sean, 11, and Jayden, 10, with her ex-husband Kevin Federline, admitted it will be "really scary" when the youngsters are even more grown up because she still feels like they are "babies".
She said: "It's a little strange. I'm nervous because I know 12 and 13 and 14 and 15 are going to be really scary.
"I'm going to be like, 'Mum please come to the house and help me out!'
"But no, it's a great age. They are still babies."
The blonde star - who was also married to friend Jason Alexander for just 55 hours in 2004 - admitted she isn't too worried about being single after splitting from US TV producer Charlie Ebersol last year, because she is finding out more about herself on a daily basis.
She added to The Sun newspaper: "I am in a really good place right now. I am loving and learning about myself every day and learning who I am.
"It's awakening, it's cool. It's OK to be single - it totally is."
However, Britney is not fine when it comes to snakes as she has always had a fear of the reptiles - even when she performed at the 2001 MTV Video Music Awards with a huge albino python draped over her shoulders.
She recently said: "I think it was great but I wouldn't do that now. Never. I'm totally scared of snakes but I was completely fearless. It was cool.
"I was [scared of snakes back then], but I was just so excited that I was like, 'Whatever!' "