This can be caused by a large lamb, a small ewe, a small pelvis or any combination of the three. This is probably the most common delivery problem in sheep. It is most common among young ewes or flocks that have a preponderance of singles. Presentation of the lamb can be normal and birthing is still not progressing. Often the lamb is in the birth canal and may be partially presented.
Firm pressure is often all that is needed to remove the lamb.
The best method of applying pressure is to grab a front leg below the knee and pulling it in a downward arc towards the ewe's hocks until it is extended. Take care that the head is coming and you may actually have to pull the skin over the lamb's head. Then pull the second leg into an extended position just like the first. From this point, steady, firm pressure may be all that is needed. If the lamb is still not coming, steady arcing pressure towards the ewe's hocks should be continued with a slight swaying or rocking from side to side.