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Alison and Austin Havens welcomed their third baby, son John "Mac" Havens, on July 17, 2024

The mom of three tells PEOPLE that her "99th percentile baby" quickly earned the nickname Big Mac

A stop at McDonald's weeks after he was born led to the realization of how his nickname created a great birthday party theme

The family found the perfect nickname, and thus the perfect birthday party theme, for their not-so-little boy.

Alison Havens and husband Austin welcomed son John "Mac" Havens on July 17, 2024. The couple has been excited for the milestone moment where their final baby turned one. From early on, Mom knew exactly what the theme would be.

"Mac is our third baby, and he was born very, very big, and he just stayed that way for the first full year. He was born 9 lbs.

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