It’s quite clever design, really. They drank out of the broad side once they grew up, so why not out of the small end as babies?
It’s like a natural funnel (that just happens to resemble those ear trumpets old Victorian gentlemen used).
Here the archeologists found wooden feeding devices made of cow horns. The Slavs used to attach leather sacks with milk to the broad ends of hollow horns and their babies would suck the milk through holes in the narrow part of horns.
How can a wooden feeding device be made of cow horns, you ask? Best not delve. Sometimes the press release translations can get a little wacky.
No preliminary dating of the find yet, but I’m going to front like I know what I’m saying and guess that it’s medieval. Veliky Novgorod was big in the middle ages.