playpen

[ pley-pen ]

/ ˈpleɪˌpɛn /

a small enclosure, usually portable, in which a young child can play safely alone without constant supervision.

Origin of playpen

First recorded in 1930–35; play + pen²

I say it is not necessary for a young couple to have a playpen for a baby.

Warren Commission (1 of 26): Hearings Vol. I (of 15) |The President's Commission on the Assassination of President Kennedy
The motel was run by a young married couple, and I watched the woman come out and put her baby in the playpen.

Exile from Space |Judith Merril
Then I bought at Montgomery Ward a playpen for about $11 for the kid.

Warren Commission (8 of 26): Hearings Vol. VIII (of 15) |The President's Commission on the Assassination of President Kennedy
And I will point out the character of my son, and what I am saying about the playpen and so on.

Warren Commission (1 of 26): Hearings Vol. I (of 15) |The President's Commission on the Assassination of President Kennedy

There was the bare necessities; there was no playpen or crib for the baby.

Warren Commission (2 of 26): Hearings Vol. II (of 15) |The President's Commission on the Assassination of President Kennedy

playpen

/ (ˈpleɪˌpɛn) /

a small enclosure, usually portable, in which a young child can be left to play in safety