Hypnobirthing involves self-hypnosis, relaxation and breathing techniques that expectant mothers can use instead of pain relief during labour.
Cotton wrote: "Love my yes mum cards from @theyesmummum who brilliantly guided me through hypnobirthing before my big day. Having a natural, pain relief free birth was the most intense and euphoric experience ever."
In her post, Cotton continued: "My first birth was a different story so I've experienced varying sides of birth and I'm glad for both.
"Although all we want is a healthy baby I think we should remember how amazing the female body is and the strength of a woman.
"Obviously there is no right or wrong birth and they can be magical in many ways I just feel blessed to have had this experience thanks to hypnobirthing."
Cotton prompted other mums to share their hypnobirthing stories in the comments.
One mother wrote: "I did hypnobirthing with my second child too and loved every minute of my birth, embracing my surges and allowing my body to relax and bring her into the world peacefully.
"I was in the paper as midwife didn't believe I was in labour or 'pushing' until she appeared."
Cotton, who also has two-year-old son Rex with husband Jesse Woods, has recently shared some photos of congratulations gifts she's been receiving on Instagram.
Her most recent post showed a craft session with Rex - making thank you cards for the presents she received.
"Up with Rex making thank you cards #art #nerds" she added.