A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out that the baby is sick?

Baby is too small to complain on its own. During such cases, following symptoms should be checked for, as these are the common symptoms seen when the baby is ill. They are:
(a) Increase in the body temperature
(b) Constant crying
(c) Watering of the eyes
(d) Not eating food
(e) Vomiting and diarrhoea.
Sickness is a condition used to refer to physical illness or disease.