What's the best way to transition from one kid to two? Like Kristen Bell and Dax Shepard, Chrissy Teigen and John Legend are all about tag-team parenting.

The couple welcomed baby Miles just a few weeks ago, and according to Legend, that means he's spending a lot of time with their toddler daughter, Luna. "When Chrissy's breastfeeding, I'm out playing with Luna in the yard," Legend told reporters at the Los Angeles Dodgers Foundation Blue Diamond gala at Dodgers Stadium, according to Us Weekly. "The idea of splitting up is a little different than what we had before. But it's good to have two of us there to handle the two of them."

The way Teigen and Legend are splitting the parenting duties works for them, and science suggests is good for Miles and Luna, too.

Support and positive involvement from a baby's father has been shown to help moms continue breastfeeding for longer. Whether that support looks like taking care of the toddler while mom feeds the infant, like in Legend's case, or straight up spoon feeding mama while she nurses, like The Rock recently showed us, support from dad goes a long way.

Right now, Miles is spending more time with mom than dad, but as he grows things will no doubt even out. Legend says he's also waiting for 3-week-old Miles to grow a bit before he decides which parent he looks more like. "He's so tiny," Legend said. "If you look at Luna's pictures, when she was a couple weeks old she looks a lot different now than she looked then. So we'll give him time to grow into his face."

As Miles grows into his face, it's obvious Legend is growing into his role as a father. Having two is pretty different than raising just Luna, but Legend is already thinking about trying for baby number three. "We'll probably have more," he said, adding that while they're busier than ever, he and Teigen are closer than ever too, because raising kids is a joint project.

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But raising a mentally strong kid requires parents to avoid the common yet unhealthy parenting practices that rob kids of mental strength. In my book, 13 Things Mentally Strong Parents Don't Do, I identify 13 things to avoid if you want to raise a mentally strong kid equipped to tackle life's toughest challenges:

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