“Megan is doing great, but a little bit more tired this time,” a source close to Green tells PEOPLE of Fox, 30, who gave birth to her third son, Journey River, with the actor on Aug. 4.
“Everyone is just adjusting to being a family of five with a newborn,” the source adds. “It’s a lot with three kids. The baby is doing well though. Megan and Brian seem very happy.”
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The couple, who reside in Malibu with their family, are also parents to sons Bodhi Ransom, 2½, and Noah Shannon, 4 next month. Green, 43, has a 14-year-old son named Kassius from a previous relationship.
Married since 2010 and together for a total of over 10 years, Fox and Green recently reconciled after Fox filed for divorce in 2015.
“Brian and Megan are living together in Malibu with their boys,” a source told PEOPLE in July. “They have been getting along and seem very happy.”
For more from Megan Fox and Brian Austin Green, pick up the latest issue of PEOPLE, on newsstands Friday.
— Jen Juneau