Spiders are usually solitary creatures, so the presence of multiple spiderlings side-by-side suggests that they didn’t disperse after birth, choosing instead to stay alongside their mother.
It’s because they’ve evolved such a bizarre array of ways to achieve their ultimate goal of siring spiderlings with a monster of a mother.
Indeed, the web of this untutored little spiderling will be as characteristic of its species as the white spot upon its back.