MarkTAW is correct.
to expand, there are a few subtleties to keep in mind:
-always keep a "C" curve in your fingers, like they a wrapped around a soda can (but relaxed)
-when you fret with your1st finger , the other 3 should be relaxed with tips hovering less than an inch above the string -no "flying fingers"
-when you fret with your 2nd finger, the 1st finger should be down on the neck behind it in support.
-when you fret with the 4th, all 4 fingers should be against the neck similarly.
-keep you wrist straight -adjust with the neck tilt and strap height to help.
and the biggest "secret" to 1-2-4 fingering is that it is not necessary to stretch you fretting fingers uncomfortably. you are allowed to move your hand around 'within one position.' Just keep your thumb in the same spot, and use it to pivot /slide your palm and fingers further up the neck to reach, then slide back down as needed. even with short fingers you can probably span 5 or 6 frets this way.
Ideally your supporting finger tips will stay on the exact fret they start on, and learning to stretch them at least that far is useful. but with small hands you simply may not be able to.
Many feel that 1234 if more efficient and therefore you can be faster, but I'm conifdent that with practice a 124 fingering can be just as fluid and musical as 1234 fingering in 99% of the playing a bassist will be asked to do. Carol Kaye plays this way, and it obviously didn't hurt her career
