Speaking about Wild Refill deodorants, Helen wrote alongside the sultry snap: "I was drawn to the brand because I like to make eco-friendly choices when I can.
"Also an effective deodorant is important to me as with hormones I do feel like I perspire more with breastfeeding my baby and I find this really works for me," she explained.
"I like the fact that @wildrefill uses natural ingredients with my baby being near my armpit while nursing."
Fans flocked to the comments section to show Helen some love, with one writing: "Omg that can’t be just after you’ve had that beautiful baby, you look amazing!"
Another posted: "You look amazing!!!"
"How do you look like that after having 3 babies, wow! Amazing!!" someone else gushed.
A fourth fan simply penned: "You look incredible!"
Elaborating on her eco-approach in a short clip posted to her Story, Helen explained: "I really really like to use eco-friendly products when I can – I use eco-friendly nappies, eco-friendly wipes, I used eco-friendly maternity pads after having Charlie.
"I like to make those choices when I can."
Helen has hit out at critics in the past who implied she was putting pressure on other mums to bounce back quickly from pregnancy after she shared a bikini snap just eight weeks after Charlie’s birth.
In the sweet picture, Helen posed alongside her daughters Matilda, six, and Delilah, two, all wearing matching swimwear.
A source said at the time: "Criticism is hard for Helen as she’s openly admitted to being insecure and is very self-aware.
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"The photo was a happy moment with her girls and she did feel content in her body. She got a lot of really lovely comments but the negative comments from mummy-shamers still crept in and they do hurt."
Helen said she wants her girls to feel confident in themselves and their own skin, and has commented previously: "As a mummy of girls I want to show them how to be confident in their own skin and to love themselves.
"I do affirmations with them on the school run such as ‘I am amazing’ and ‘I can do anything’."