Adele, 27, acknowledged it was "weird" taking a break from music but feels it was the right thing to do, reported Female First.
The singer will release "25" on November 20.
"I know some people thought I was mad for taking a break. Even I can see it was a bit weird. But I'm glad it happened. I think it was the right thing. It slowed everything down."
Asked about her motivation to return, she said, "My son. I felt so mega having given birth; the confidence from that, I felt unstoppable. I'm sure most women feel that. Towards the end of the '21' stuff, I couldn't remember why I was doing it any more.
Adele said she is not motivated by money.
"I'm not motivated by much, certainly not by money - but I'm motivated by that. I want my child to see his mum running a proper business again. Being a boss again. Hopefully smashing it again.