Is it possible to sex bristlenose plecos when theyre young? say at about 4 cm length? I'd like to get a pair of male & female bristlenoses but also want to get them young hehe me fussy

I found this on a pleco website:

Differentiating the male and female can initially be challenging, but once they start to mature, the male is easily distinguishable by the line of bristles between his eyes. Females may grow bristles around their lips, but will not grow the perpendicular stripe of bristles between the eyes. Another neat thing about the male is the branching bristle. Usually the main bristle on his nose will branch much like deer antlers. Spike's main bristle has about 3 forks in it, gives him a nice full rack.

hth
bw
cupoftea

No, not until they start to mature and i think thats at about the 4 inch mark.