The phrase "different phases" means different stages or periods that something or someone goes through. It refers to various steps or changes that occur during a process, like growth, development, or progress. Full definition
I find this exciting and motivating, as I can always look forward to some change or variance in food groups when I am going in and out of different phases of training. (marksdailyapple.com)
It's also likely that your child will find different ways to self - soothe in different phases of life. (babycenter.com)
There are some differences from state to state but all of them require child restraints and certain car seat models at different phases of life. (thankyourbaby.com)