Different month groups

Micheala • 💙6/7/18 💖9/19/21 💖11/12/22

How many mommas should have been in a different '18 group? I should have been in the May '18 group, but little man decided to come a week and two days after his due date. Was hoping he would have been born early (May 24th) instead of his due date of May 29th, but I guess he was either very comfortable in there or didn't want to share his birthday/birth month with mommy.