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MariLu came into the world less than six-months after mom gave birth to Eduardo, leaving most to assume the Baldwins welcomed their baby girl via surrogacy.
But the family have been fiercely private about the matter, with a source telling People their decision to have another child so quickly is 'no one's business.'
Sister act: Her Story featured a shot of eldest daughter Carmen, seven, holding her baby sister while wearing a stylish butterfly dress
Timeline: MariLu came into the world less than six-months after mom gave birth to Eduardo, leaving most to assume the Baldwins welcomed their baby girl via surrogacy