If there are two legs, make sure they are from the same calf. One front is normally slightly ahead of the other. Only the calf's tail is visible. Only the calf's head is visible. Front feet protrude past the knees, but the calf's nose cannot be located.
Feet are upside down.
The head and one foot are visible. After 30 minutes of labor there is no progress in delivery. If it is necessary to go inside the cow, be sure to wash gloves, chains, etc. with disinfectant. Use a lubricant such as mineral oil or newer cellulose products. Soaps tend to irritate.