The CDC has a milestones app that’s helpful. There are no 14 month specific milestones - 12 months and then 15 months.
As long as you’re doing lots of play, reading books, taking them outside, etc I honestly wouldn’t worry too much about milestones, people stress over them unnecessarily. It’s usually quite clear when a little one has a significant developmental delay. If you want to look at the CDC guides then they can be helpful, but remember they’re just guides 😊 https://www.cdc.gov/ncbddd/actearly/milestones/index.html
He should be doing both I think