The first weeks with a newborn are a blur of feeding schedules, sleepless nights, and one constant undercurrent of worry: Is my baby okay?
Every sneeze, every grunt, every stretch of sleep that goes too long can send a new parent into a spiral. And the hard truth is, newborns can't tell you what's wrong. You have to read the signs.
This guide walks you through 12 of the most important warning signs that your newborn may be sick — along with the behaviors that look alarming but are completely normal.
When to Call a Doctor Immediately
Before we get into the full list: if your newborn is under 3 months old and has a rectal temperature of 100.4°F (38°C) or higher, call your pediatrician or go to an emergency room right away. This is a hard rule — don't wait to see if it improves.
12 Warning Signs Your Newborn Is Sick
1. Fever (Under 3 Months)
Any fever in a newborn under 3 months is a medical emergency. Their immune systems can't fight infection the way older babies can. Don't give medication — go straight to a doctor.
2. Persistent Crying That Can't Be Soothed
All newborns cry. But if your baby has been crying continuously for more than 2–3 hours, is inconsolable, or the cry sounds high-pitched and different from their usual cry, it's worth calling your pediatrician. This can signal pain, illness, or rarely something more serious.
3. Breathing Difficulties
Watch for: nostrils flaring, the skin between the ribs pulling inward with each breath, fast breathing (more than 60 breaths per minute), or any pauses in breathing lasting more than 10 seconds. Normal newborn breathing is irregular — brief pauses of a few seconds are fine. Prolonged pauses are not.
4. Blue or Grey Skin Tone (Cyanosis)
A bluish tint around the lips, fingernails, or face is called cyanosis and indicates your baby isn't getting enough oxygen. This is a 911 emergency. Note: bluish hands and feet (acrocyanosis) are common and normal in the first few days.
5. Not Eating or Refusing to Feed
Newborns need to feed every 2–3 hours. If your baby is consistently refusing feeds, too weak or sleepy to latch, or hasn't fed in more than 4 hours, contact your pediatrician. Dehydration in newborns can escalate quickly.
6. Signs of Dehydration
Look for: fewer than 6 wet diapers in 24 hours (after day 4), dark yellow urine, dry mouth, sunken soft spot (fontanelle) on the top of the head, or crying without tears. These are signs your baby needs fluids urgently.
7. Jaundice That's Getting Worse
Mild jaundice (yellow skin tone) in the first week is extremely common. But if the yellowing is spreading to the abdomen, arms, legs, or the whites of the eyes, or if your baby seems very sleepy and difficult to wake for feedings, it needs to be evaluated. Severe jaundice can cause brain damage if untreated.
8. Vomiting (Not Just Spitting Up)
Spitting up is normal. Vomiting — forceful, projectile, or containing blood or green/yellow bile — is not. If your newborn vomits after every feed or projectile vomits across the room, call your doctor.
9. Diarrhea or Unusual Stools
Newborn stools change frequently. But watery stools, 8+ dirty diapers per day, or any blood in the stool should be evaluated by a doctor. Diarrhea in newborns can cause dangerous dehydration very quickly.
10. Extreme Lethargy or Unresponsiveness
Newborns sleep a lot — up to 16–18 hours a day. But if you can't wake your baby for feedings, they're limp and floppy, or they seem unresponsive to your voice and touch, seek medical care immediately.
11. Rash With Fever
Many newborn rashes are harmless (baby acne, milia, erythema toxicum). But any rash that appears alongside a fever, spreads rapidly, or consists of purple or red spots that don't fade when pressed warrants immediate medical attention.
12. Swollen or Red Belly Button or Circumcision Site
Some redness and discharge around the umbilical cord is normal. But pus, a foul smell, redness spreading to the surrounding skin, or bleeding that won't stop means the area may be infected — call your doctor.
What's Normal (That Looks Scary)
Before you panic, here are some newborn behaviors that frequently alarm parents but are completely expected:
- Grunting and straining during bowel movements — normal, they're just learning to use their muscles
- Hiccups — very common, usually harmless
- Sneezing — newborns sneeze to clear their nasal passages, not because they're sick
- Irregular breathing patterns while sleeping — brief pauses of a few seconds are normal
- Bluish hands and feet in the first few days — normal circulation adjustment
- Baby acne — appears at 2–4 weeks, clears on its own
When in Doubt, Call
Your pediatrician would always rather hear from a worried parent than have you wait too long. Trust your instincts. You know your baby. If something feels wrong, make the call.
For a comprehensive guide to reading your newborn's health signals — including what symptoms need urgent care, what can wait until morning, and how to assess your baby at home — our guide Signs Your Newborn Is Sick covers it all in one place.