It's possible for them to consume 21-25 percent of their body weight daily. Frequently check the mare's udder. A full udder dripping milk indicates that the foal hasn't nursed, which is a sure sign it's sick. If you creep feed foals, check to make sure each is eating. Foals with a temperature usually don't have much appetite.
Newborn foals lie on their sides sleeping and resting much of the time.
When aroused, they hop to their feet and stretch. This shows that the foal feels good. Since foals are normally active, be suspicious when one lies down too much or stands with its head down while other foals are playing. Check them for fever and injuries. It's a good idea to touch foals to learn the feel of their normal body temperature.