Calving season is a busy time of year for cattlemen and it is a critical step toward a productive year. The first rule is frequent observation of those cows due to calve, especially the first calf heifers. This is usually a very busy time of year and some extra help during this season will more than pay for the cost through extra calves saved. Even wives and older children can help a solo producer get some needed sleep. If, they have been taught how to observe, they can tell when a calving cow needs help and if there’s a need for assistance. With a few days of practice, they’ll be almost as good at observing as you are (and maybe better). Checking every 3 hours is usually adequate.
Bagley, Clell, "Assisting with Calving" (1997). All Current Publications. Paper 441.