Sam continued to preach how eternally grateful he and partner Rebecca James is to have Margot "choose" them.
"You are the most important person in our world. We both can't stop staring at you. Your tiny fingers, your little ear lobes, the fat rolls on your neck. Every part of you is perfect to us.
"We even stare at you while you're sleeping (an activity that would normally have us placed on a watch-list)."
While Sam see's himself as "best supporting actor" and "Bath Boss" in the parenting world, he gave a shoutout to Rebecca for "giving [Margot] absolutely everything she's got".
"Sometimes she's exhausted & in pain, but she doesn't let you see that. She shows you nothing but love. It's a privilege to see both of you grow together. You'll be tough like your Mum one day, I have no doubt."
"It's very early days. We're a brand new family working it all out together, bit by bit. It's daunting, it's tiring, but it's mostly exhilarating. So much fun ahead for the 3 of us. & do you know what, I feel like you already have more in common with your dad than you might think.
"We're both extremely grumpy when woken up & we both have an unhealthy fixation on boobs. That's my girl.
"Happy 1 Month Margot X."
Just a few days after her birth, Sam posted a video of him breaking down in tears as he looked over a sleeping Margot. His more recent appreciation post proves that his fatherly love for his daughter is stronger than ever.
This article originally appeared on our sister site, NowToLove.
Watch Below: Sam Mac prepares nursery for his first child