Retirement continues to be good to Michael Phelps.

On Tuesday, Phelps and wife Nichole announced on Instagram they are expecting their second child.

“Number 2 on the way!!!! So excited!! Wonder if it's a boy or a girl?” Phelps wrote.

Phelps’ son, 15-month-old Boomer, was born in May 2016.

Boomer’s popular Instagram page posted a photo reacting to the news that he’ll be a big brother.

"So excited to see what mama is having!!" the announcement post said. "Do I get to have a brother or a sister?!?"

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