He's enjoying this little girl so much that "it's just the two of us," he said of having no nanny right now. "It's awesome."
He joked that his daughter is like a new cellphone.
"When you first get them, you're all excited and you're like ready to do all these things," he told Ellen DeGeneres on her show this week. "Then you realize it's like getting a new cellphone, where all the features don't work yet. It's like a phone that won't take pictures. It's like, 'Why is my new phone not taking pictures?' And it won't make calls, it doesn't do a lot, but it looks really cute."
Kutcher, 36, also loves watching his baby develop and learn new things.
"She found herself in the mirror and realized she was able to control the thing in the mirror," he said. "The most amazing thing about having a baby is my partner, Mila. She's the greatest mom. I go to work everyday and come home and she's like perfect and everything went amazing."
He added that Kunis, 31, never complains.
As for raising the baby together without a nanny, Kutcher said, "We just want to know our kid. We want to be the people, who know what to do when the baby's crying ... we want to be emotionally in touch with her ... you think you know how much you can love another person, then you have a child and you realize you didn't know."
He continued, "I look at this as the greatest opportunity of my life."
With the paparazzi always around, Kutcher said "I would just like to use the stroller once, like we don't get to go to the mall and stroll. I've assembled a lot of things that we haven't gotten to use yet."