“Omg I thought his lil heel was a nipple,” one fan commented.
“Totally thought it was a nipple! Then realised it was foot....” said another.
While one follower admitted she “wouldn’t have even noticed” the 'nipple', she now “can’t unsee it”.
But don't panic, it is just little Mason's heel and Abby added a note to the photo on Instagram, reassuring fans that it was just Mason's heel!
“Ps that’s his foot, not a nipple,” she wrote, along with a laughing emoji.
Mason is the first baby for Abby with her boyfriend Leighroy Wellington.
She shares her two girls, Arlo and Milla, with her ex-partner Jake Stringer, who plays for Essendon. Abby is a well known blogger and is famous for her candid posts about her life as a parent, running workshops and commenting on life as a busy mum.