The 1931 Fabrique Nationale (FN) Baby Browning Pistol is a small blowback-operated semi-automatic pistol designed by Belgium-born Dieudonné Saive chambered in .25 ACP (6,35mm). The pistol features a six-round magazine capacity and is a striker-fired, single action, blow back mechanism. The manual thumb operated safety locks the slide in the closed position when engaged using side thumb pressure.

The 1931 version was marketed under the name “BABY” – and some of the original thermal hardened plastic grip plates were molded with both the initials “FN” at the top of the grip plate in a circle and the word “BABY” at the bottom of the grip plateunder a raised crescent. This particular pistol was and continues to be known worldwide as the “Baby Browning” pistol.