A hungry baby often will cry. But it's best to watch for hunger cues before the baby starts crying, which is a late sign of hunger and can make it hard for you to settle him down and let him eat.
Additional typical hunger cues include :
· Licking lips
· Sticking tongue out
· Rooting (moving jaw and mouth or head in search of breast)
· Putting his/her hand to mouth repeatedly
· Opening mouth
· Sucking on everything around