Michael Rozman/Warner Bros.

Halle Berry described her second baby as nothing less than miraculous.

"I didn't think it was possible at my age," the 47-year-old Oscar winner told Ellen DeGeneres in a new episode airing today. "They call it a 'geriatric pregnancy.'"

Berry continued, "I was, you know, on my way-this is probably way TMI-but I was really, you know, kind of premenopausal. So to have this happen was a huge."

The "Extant" star and her husband, Olivier Martinez, welcomed their son Maceo Martinez last October.

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The actress credits her 6-year-old daughter for her miracle baby, now 7-months-old.

"She prayed and prayed for him for like a year and a half for a baby and a bunk bed and she got both of those things," Berry told DeGeneres.

When DeGeneres declared, "It's a miracle," Berry replied, "Only her prayers could have done this."

Nahla, whose father is model Gabriel Aubry, is enjoying being a big sister too.

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"He's like one of her dollies that came to life," Berry said. "You know and all she wants to do is change his clothes. Like she'll purposely throw something on his shirt and say, 'Oh mommy, he's got to change his shirt. He has a mess on him!' She just likes to change his clothes, change his diapers."

But Berry has already noticed some differences between her son and daughter, especially when it comes to nursing.

She followed with a lively demonstration of Nahla's "nice little girly suck" and Maceo's much more energetic one.

"He's like sucking the life out of me," Berry exclaimed as the audience applauded in laughter. "So I see the difference between boys and girls."

DeGeneres then joked, "That was TMI in my opinion, but okay."