[post_page_title]Using accessories[/post_page_title]
Another solution to telling twins apart offered by VeryWellFamily is to use accessories. As long as the guy and his wife use jewelry or accessories that are safe for young children, it could be the end of their troubles.
Like people suggested in the Reddit thread, using bows, bracelets, and anklets are the perfect solution. They even recommend using different earrings if parents are willing to make a choice for the baby to pierce their ears, although ethically this doesn’t sit well with everyone.