Michael Phelps does not rule out baby No. 4

Michael Phelps and Nicole Jonshon

America's most decorated Olympic swimmer Michael Phelps, who welcomed third son Maverick with wife Nicole Johnson in September, has revealed that he is open to having a fourth child. The couple also have sons Boomer, three and Beckett, one.

When asked about having a fourth child, Phelps, told US Weekly, "Nothing is written in stone right now. But I definitely wouldn't count it out."

Meanwhile, Phelps said he is currently happy raising three healthy boys. "Watching them and hearing the things that come out of their mouth [is the best]. Just all the little things about being a parent, even though it can be frustrating at times. It's cool to see how much interest Boomer has in not only helping us, but helping Beckett and Maverick," he added.

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