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John Ira Shepherd Hanson may be only eight weeks old, but he’s already enjoyed a number of private performances from one of the famous Hanson brothers — it’s how he goes to sleep! Says dad Zac Hanson, 22, drummer for the band: "He’s heard a lot of original a capella dad — it’s Zac Hanson: The Solo Project!"

Showing off their son in the August 4th issue of PEOPLE, as well as in a behind-the-scenes video at PEOPLE.com, Zac and his wife Kate, 24, were initially nervous about becoming parents. With the arrival of their little boy, however, they’ve changed their tune. Zac explains,

The most surprising thing for me is how afraid people are of somethingthat is so natural once you do it. You take on that role as a dad andyou go, ‘This feels like what I was meant to do. Why would I ever beafraid of it?’

During a June 18th photoshoot in their hometown of Tulsa, Oklahoma, Zac addressed comments referring to he and Kate, as well as his brothers and sisters-in-law, as "breeding machines." Between them, the Hanson family has six children, five boys and a girl ranging in age from three weeks to five-and-a-half years.

[Kate and I] only have one baby. What’s all the drama? There’s always someone to tell you, ‘It’s okay that the baby hasn’t pooped, you don’t need to worry about that.’ But we have no intention to battle the Osmonds in any way — they can have the crown!

Click here to meet John Ira Shepherd at PEOPLE.com!

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