Jules' friends and followers couldn't help but coo over the adorable photo, with many commenting on Oliver's impressive head of hair.
"So so cool! And the world opens up from here 🙌🏼🙌🏼🙌🏼 congrats hon xxx" fitness queen Michelle Bridges posted beneath.
"Awe this photo has me feeling all the feels! I’m just so happy for you babe. I have emotional/ hormonal tears of joy and love!!" Chezzi Denyer, who is pregnant with her third child, wrote.
Jules and Cam's MAFS co-star and friend Cyrell Paule even joked: "He got mums thick hair instead of daddy’s ... Thank god," to which Jules replied: "hahah I need some some of his to thicken mine up."
New dad Cam has also shared a heartwarming post since Oliver's arrival, remarking that he's "so thankful" to welcome his firstborn.
"Hold on tight little one.. This thing called life is an amazing ride," Cam, 36, wrote.
"So thankful to welcome a healthy & gorgeous little Oliver Chase Merchant into our lives. What an incredible experience & one that I will never forget."
He added: "Mum was amazing throughout & doing well & I’m not sure I can describe the love I have & so thankful to hold your little hand throughout."
Jules broke the news of her new bub's arrival with a video montage of her birthing experience, that featured their newborn son's tiny hand and also revealed the name.
"#loveatfirstsight I would do it a thousand times again for you Oliver Chase Merchant," she wrote.
"Our little man has arrived ❤️ #surprise #itsaboy healthy and beautiful and my heart is full. We are home now and enjoying the love bubble and getting to know our lil man Ollie who has the world ahead of him."
The new parents, who met and fell in love during their time on Married At First Sight, have since returned home with their new arrival.