The 36-year-old actress - who adopted son Jackson in March - said at the London premiere of her movie Snow White and the Huntsman that everything before he came into her life is a blur.
She told E! News: "It's strangely everything that you've hoped for and it feels so right. I don't know how else to say it.
"I feel like I can't remember anything prior to him. I feel like it was always just meant to be what it is."
The single parent celebrated her first Mother's Day overseas as the American holiday fell on Sunday.
She revealed: "My mum and Jacks are here with me. We had a nice morning. He got to spend a little time with me and he got to have a little snuggle.
"I'm going to see them later tonight. It's really nice to have him here."
Charlize - who hasn't been in a serious relationship since ending her nine-year partnership with Stuart Townsend in 2010 - is amazed by how quickly her bond with the baby began.
She added: "It's an overwhelming sensation of love. Everyday I'm just like, 'It's not possible to love you more,' and then 20 minutes later you're like, 'Oh my god! How is this possible?'"
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