When to Call the Pediatrician: Signs Your Newborn Might Be Sick

Learn the key warning signs that your newborn may be sick and when to call the pediatrician. From fever and feeding issues to breathing problems, this guide helps new parents act quickly to protect their baby’s health.

Fabiola Cardoso

8/9/20252 min read

a black and white photo of a person holding a baby's hand
a black and white photo of a person holding a baby's hand

When to Call the Pediatrician: Signs Your Newborn Might Be Sick

As a new parent, it is natural to feel protective and cautious when it comes to your newborn’s health. While some changes in your baby’s behavior or appearance can be completely normal, others may signal that something is not right. Knowing the signs of possible illness can help you take action quickly and ensure your baby gets the care they need.

Here are some important situations when you should call your pediatrician without delay.

1. Persistent High Fever

A newborn’s immune system is still developing, which makes them more vulnerable to infections. If your baby is younger than 3 months and has a rectal temperature of 100.4°F (38°C) or higher, you should call your pediatrician immediately. A fever can be a sign of infection, and quick medical evaluation is essential. Even a slight temperature change in the early weeks can be significant.

2. Difficulty Breathing

Labored or rapid breathing, grunting sounds, or a bluish color around the lips or face are warning signs that your baby is not getting enough oxygen. Breathing difficulties can result from respiratory infections, blockages, or other serious conditions. If you notice any of these symptoms, seek medical attention right away. Babies breathe faster than adults, but extreme changes in breathing patterns should never be ignored.

3. Poor Feeding or Refusal to Eat

A healthy newborn usually feeds every 2 to 3 hours. If your baby consistently refuses to eat, shows weak sucking, or seems too sleepy to feed, it can indicate an underlying health issue. Poor feeding can lead to dehydration and low blood sugar, both of which require prompt medical evaluation. Keep track of your baby’s feeding patterns and wet diapers so you can share this information with the doctor.

4. Vomiting or Diarrhea

While occasional spit-up is normal, forceful vomiting (projectile vomiting) or frequent watery stools can be a sign of illness or digestive issues. Persistent vomiting or diarrhea can cause dehydration quickly in newborns. Signs of dehydration include a dry mouth, fewer wet diapers, or a sunken soft spot on the head. Call your pediatrician if you notice these symptoms.

5. Unusual Sleepiness or Lethargy

Newborns sleep a lot, but they should still wake for feeds and respond to touch or sound. If your baby is unusually difficult to wake, shows very little movement, or seems weaker than usual, it could be a sign of illness. Extreme sleepiness can be linked to infections, jaundice, or low blood sugar, all of which require medical attention.

6. Skin Color Changes

A sudden change in skin color, such as paleness, bluish tones, or persistent yellowing, can signal a problem. Yellowing of the skin or eyes (jaundice) is common in newborns but should still be monitored closely. Severe jaundice can lead to complications if left untreated. Blue or gray skin tones can indicate poor oxygen levels and require urgent evaluation.

7. Signs of Infection

Look for redness, swelling, pus, or warmth around the umbilical cord stump, circumcision site, or any skin wounds. Newborns are more susceptible to infections, and these can spread quickly. Call your pediatrician if you see these signs or if your baby develops a rash that spreads rapidly or is accompanied by fever.

Final Thoughts

It is always better to err on the side of caution when it comes to your newborn’s health. Trust your instincts as a parent. If something feels wrong, do not hesitate to contact your pediatrician. Prompt medical attention can make a big difference in preventing serious illness.

P.S. Every baby is different. This article is for informational purposes only and should not replace professional medical advice. Always consult your pediatrician if you have concerns about your baby’s health.