I truly can't believe McKenna is turning 3 years old this year. I feel like we were just celebrating her 1st birthday yesterday! Even though we didn't have a party for her 2nd birthday, we still did a "Two Two" Train themed photo shoot for McKenna's birthday using one of my ideas from my Birthday Party Themes for 2-Year Olds post. I am super indecisive and can't pick a theme until the last minute, so I decided to share my list of 3rd birthday themes in case anyone else is a procrastinator like me! Keep reading for 8 birthday party themes for 3-year olds!