The Liberty X and Big Reunion star's son Aaron Jay was admitted to hospital at just five weeks after falling ill.
While she initially thought he may have reflux disease, tests later diagnosed the tiny tot with viral meningitis – and Michelle is now encouraging fellow parents who believe something isn't right with their child to have it checked out.
Speaking on ITV's Lorraine, the mum-of-two explained: "I took him in for something completely unrelated – mother's instinct, we always know best. Always trust your instinct. I knew something wasn't right but I didn't know what.
"He didn't have a fever or rash or any tell tale signs of meningitis. He was just bringing up his bottles and I thought maybe he had reflux disease and I wanted it checked out."
Michelle, 34, said she phoned the NHS 111 service which advised her to take Aaron to A&E because of his age.
"Within minutes he was rushed into a room where they administered a lumber puncture on his spine," she recalled. "He was diagnosed with meningitis. At that point they're never sure if it's viral or bacterial so they administer antibiotics for whatever length of days he's in hospital just in case it is bacterial for when the results come back."
Michelle admitted she hadn't been aware there are two types of meningitis until her ordeal and is now encouraging parents to understand the signs and symptoms.
Of the future, she added: "He'll have a couple of exams in a couple of months time, hearing, sight and they'll look at his heart but the risks are minimal."
Singer Michelle gave birth to Aaron Jay, her second child, on 28 February. She and personal trainer husband Hugh Hanley are also parents to daughter Faith, two.
Tweeting on 14 April after Aaron left hospital, she told fans: "It's been nine days now since our little man was admitted into hospital with viral meningitis (with the chance of bacterial meningitis).
"Even though he was discharged home middle of last week, he still attended hospital everyday for antibiotics and regular blood tests. Today, we received the news we've been waiting for. All recent blood tests are clear and the antibiotics can stop."
Earlier this year, Michelle was crowned Disney's Celebrity Mum of the Year, an accolade she told Reveal that she's extremely proud to win.
"Being a good mum is just being there for your children. It's about loving them, taking care of them and providing for them as best you can. Not necessarily financially, but emotionally, and giving them lots of hugs. I love it – it's the best job in the world. Just seeing the delight on their face if you give them a cuddle or give them praise is wonderful."
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