Ashton Kutcher has been "so helpful" since Mila Kunis gave birth to their baby daughter Wyatt Isabelle on Sept. 30, a source shares in the new issue of Us Weekly Credit: FOX via Getty Images

A-plus parenting, @aplusk! Ashton Kutcher has eased right into fatherhood since welcoming baby girl Wyatt Isabelle with love Mila Kunis on Wednesday, Oct. 1. The Two and a Half Men star, 36, is totally committed to being a hands-on dad, a source shares in the new issue of Us Weekly

"He's been so helpful — chipping in for feedings — and he loves to hold the baby," the source says. "Ashton and Mila are both adjusting well."

Indeed, Kutcher had the doting-dad act down pat even before his fiancee gave birth last month. Back in May, the then-pregnant Black Swan actress told Ellen DeGeneres that her former That '70s Show costar had anticipated her cravings and stocked up on all the right snacks very early on.

"He assumed that I was gonna have goofy cravings, so he stocked our secondary fridge with weird food — just, like, pickles and sauerkraut, or like, anchovies and ice creams — just in case at one point during this pregnancy I'd be like, 'I really want something,'" the 31-year-old star said at the time. "And it happened!"

For her part, Kunis bonds with their daughter on little walks around the gated community in Beverly Hills where they purchased a $10 million pad earlier this year. She plans to stay home with the baby until winter.

"I have never wanted to be the person who only has business on her mind," the Friends With Benefits star told W magazine in July. "To me, this job has always been a hobby that turned into a great profession, but I don't eat and breathe acting...I'm excited about being a full-time mom."

For more on Mila and Ashton's baby joy — including their plans for baby Wyatt's first plane ride and why they joked they were "nervous to have a daughter" — pick up the new issue of Us Weekly.