
Grain scale. We pick up the cria and weigh, then subtract my weight and this we follow for a month. By weighing daily we see the progress of gain.
I have heard some cria have gained 1 pound per day. If ours gain ½ pound and not show a loss we are satisfied. All of ours have weighed in over 23 pounds when born. We have heard many coming in at over 30 pounds. Our largest came in at 30 pounds.
Sometimes goat milk or cow milk is used to supplement the feeding of these little guys if for some reason the mom cannot supply enough for nursing. I find it is better to feed in small amounts several times a day. You can read books on tubing of llamas. I would rather they nurse as they need from a bottle and nipple. But always be concerned that they bond with the mom.