Fred Savage and wife Jennifer Lynn Stone welcomed their third child recently, tweeting a photo of the bundle of joy on Monday.
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"He's here," Fred, 36, wrote, captioning a picture of his newborn son's hand.
The baby joins 6-year-old brother Oliver and 4-year-old sister Lily.
The Wonder Years star isn't the only one in the family with big news this week, as Fred's brother Ben Savage announced that he will reprise his Boy Meets World role as Cory Matthews in a pilot for Girl Meets World. Danielle Fishel (who played love interest Topanga Lawrence on the '90s sitcom) has also signed on for the project.