Despite changes in weaning age, health status and management, piglets still require special feeds to overcome the sudden trauma of early weaning, especially on large farms.
Twenty years ago, early weaning of piglets was defined as 14 and 21 days of age in the U.S. and most of Europe, respectively. Today, weaning ages have advanced to about 21 days in the U.S., and by law, 28 days in the EU (although for the latter, 25 days remains the practical average). Thus we see that weaning age has advanced back to where it used to be, and it will supposedly remain at these ages for the foreseeable future. I doubt the EU will force its members to adopt the 35-day norm followed by some of its members, but more radical regulations have been adopted in other cases.