I don't know where you live but I did find the following which sounds very much like your calf.
These feeding trials were conducted at the USDA Poisonous Plant Research Laboratory at Logan, Utah. Pregnant cows were fed either silky or tailcup lupines during various periods of gestation and in some cases their calves were born deformed. Both plants produced the condition, but cows were susceptible only during certain periods of gestation.The principal hazardous period proved to be the 40th- 70th days of gestation. Based on the results of the feeding trials, we believe that period is the only period of serious concern to ranchers. Deformed calves in the feeding trials were born with deformities like those of crooked calf disease field cases. Crooked calf disease deformities included bowing or twisting of legs with joints often locked in unusual positions. Either front or rear legs can be involved, but usually front. Careful examination
of defleshed leg specimens shows that there can be malalignment of the joint bones or curvature or rotation of
long bones.