Prince Harry & Meghan Markle Take Archie Out to a Pub

Prince Harry and Meghan Markle are giving their royal baby a taste of the commoner's life by attempting to go undercover for an ordinary day at a British pub.

The Duke and Duchess hit up The Rose & Crown in Windsor, England and as you can see in photos obtained by TMZ … they blended right in with their infant son, Archie.

Harry had a tight grip on Archie's car seat while Meghan lugged some more baby gear, during the family outing a few Sundays back. The royal tyke, who was less than 4 months old at the time, had a blanket over him and appeared to be napping.

Instead of taking in a cricket or rugby match on the telly … we're told Archie kept pretty damn quiet for the 2 hours the family was there. Not a single peep outta the little guy — even when Mom changed his nappy, (that's what they call diapers).

Mom and Dad enjoyed a roast dinner, the house specialty, and Harry helped himself to a couple of pints while Meghan settled for water. We're told they were treated just like all the other patrons — who didn't bother the royals at all. So much so, one witness said it almost seemed like many customers didn't even recognize them.

They weren't all that incognito though … with private security and 2 police officers in tow.

By the way … the pub is just a stone's throw away from Frogmore Cottage, where Harry, Meghan and Archie live.