How can i tell if infant is sick?

Lack of energy: If an infant is ill, he/she will lack a vigorous cry, lack interest in feeding. The infant will sleep much more than normal. The muscle tone may be relaxed. The infant may have a lack of a normal suck. If you push your finger on the palm, and the color pink is slow in returning, the infant may be dehydrated or lack oxygen. Also observe the breathing effort; if fast seek help. See a doctor ASAP!