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According to Parents.com, weight loss starts immediately after giving birth because the uterus shrinks back down.
Maintaining a healthy diet is important, but it usually takes months for mothers to get close to their normal weight.
Postpartum: The Big Brother star, 27, shared this photo to Instagram of herself posing side-on in front of a mirror while wearing black tights and a white singlet. My tummy has gone down fast just from healthy eating, she captioned it
Skye and her boyfriend, tradesman Lachlan Waugh, announced the arrival of their second son last Friday.
The couple shared a series of photos to Instagram of their older son, two-year-old Forest, meeting his newborn brother in hospital.