When to Call the Pediatrician: A Newborn Symptom Guide

Bringing a newborn home is equally exhilarating and nerve-wracking. One moment you're marveling at those tiny fingers…the next, you're frantically Googling whether that sound your baby just made is normal. (Spoiler: Newborns are extremely noisy.) Knowing when to pick up the phone and call your pediatrician—versus when to take a breath and watch and wait—can make those early weeks feel a whole lot less daunting.

This guide walks you through the most common newborn symptoms that warrant a call to your baby's healthcare provider, plus a few that mean you should head straight to the emergency room. When in doubt, remember: There is no such thing as calling your pediatrician too much in the newborn period. That's what they're there for!

Fever in a Newborn

This one is non-negotiable. If your baby is 2 months old or younger and has a rectal temperature of 100.4 degrees Fahrenheit (38 degrees Celsius) or higher, call your pediatrician immediately—or go to the emergency room if you can't reach them. The American Academy of Pediatrics (AAP) is unwavering on this point. Fever in a young infant can be a sign of a serious bacterial infection, including sepsis or meningitis, and requires prompt evaluation, even if your baby doesn't seem sick in any other way.

Young babies don't always show illness the way older children and adults do. A high temperature is sometimes the only clue that something serious is happening. Do not give fever-reducing medication before speaking with your baby's healthcare provider, and never assume a fever will pass on its own in the newborn period.

Trouble Breathing

Normal newborns are famously irregular breathers—they may pause for a few seconds, speed up, then slow down again. That can be normal, but certain breathing patterns signal distress, including:

• Rapid breathing (more than 60 breaths per minute)
• Nostril flaring with each breath
• Grunting at the end of each breath
• Chest retractions—when the skin pulls in between or below the ribs with each breath, so that the ribs visibly protrude
• Bluish color around the lips or fingernails (called cyanosis)

Any of these signs are your cue to dial your pediatrician right away—or call 911 if your baby appears to be in significant distress or is turning blue.

Jaundice That's Spreading or Getting Worse

Newborn jaundice—the yellowing of a baby's skin and eyes caused by elevated bilirubin—is incredibly common. According to the AAP, jaundice typically appears first on the face before spreading to the chest, belly, and limbs as bilirubin levels rise. Mild jaundice often resolves on its own, but call your baby's healthcare provider if:

• Yellow coloring appears in the first 24 hours of life
• The jaundice spreads from the face to the chest, belly, arms, or legs
• Your baby seems more yellow each day rather than less
• Jaundice is accompanied by poor feeding, extreme sleepiness, or a high-pitched cry

Left untreated, severely elevated bilirubin can cause a serious form of brain damage called kernicterus. Your healthcare provider will typically check bilirubin levels before hospital discharge and again at the 3- to 5-day well-child visit. If yellowing seems to be intensifying at home between appointments, don't wait—call.

Poor Feeding or Fewer Wet Diapers Than Expected

Newborns need to eat frequently—typically eight to 12 times per day in the first weeks of life—and feeding well is one of the most reliable markers of health in early infancy. Call your pediatrician if your baby:

• Refuses to latch or take a bottle for more than one feeding in a row
• Seems too sleepy to wake up for feedings
• Has fewer than six wet diapers per day after day four or five of life
• Is not gaining weight as expected

Wet diaper counts are one of the best at-home indicators of whether your baby is getting enough milk or formula. The AAP notes that after the first week, fewer than six wet diapers per day—or dark yellow urine—can signal inadequate intake. (The Happiest Baby App makes it easy to track wet and dirty diapers, so you don’t have to keep track of every change in your head!) Dehydration in newborns can escalate quickly, so trust your instincts if something feels off.

Umbilical Cord Concerns

The umbilical cord stump typically dries and falls off within one to three weeks after birth. Until then, keep the area clean and dry. Contact your pediatrician if you notice any of the following:

• Redness or swelling spreading onto the skin surrounding the stump
• Yellow or foul-smelling discharge from the cord
• Active bleeding that doesn't stop with gentle pressure
• Fever alongside any cord-related symptoms

These can be signs of omphalitis, a bacterial infection of the umbilical stump that requires prompt medical treatment. A small amount of dried blood at the time the stump falls off is normal; active bleeding or spreading redness is not.

Unusual or Inconsolable Crying

All newborns cry! it's their only way to communicate. But a cry that sounds different from your baby's usual cry should grab your attention. A high-pitched, inconsolable cry lasting more than a few hours can be a sign of pain, illness, or neurological distress. If your baby is crying more than usual and has other symptoms (fever, rash, vomiting, poor feeding), call your healthcare provider.

It's also worth knowing about hair tourniquet syndrome, a surprisingly common cause of sudden, inconsolable crying in young babies. A strand of hair or thread can wrap tightly around a tiny finger, toe, or other body part, cutting off circulation. Always do a thorough head-to-toe "strip check" when you can't figure out why your baby is crying.

Forceful or Bilious Vomiting

Spitting up—small amounts of milk after a feeding—is perfectly normal. Vomiting is different: It's more forceful and larger in volume. Call your pediatrician if your newborn:

• Vomits forcefully (projectile vomiting) after multiple feedings
• Vomits green or yellow (bile-stained) fluid—this is always a reason to call
• Has vomiting accompanied by fever, lethargy, or signs of dehydration
• Is not gaining weight

Forceful, projectile vomiting after every feeding can be a sign of pyloric stenosis—a narrowing of the passage between the stomach and small intestine. Pyloric stenosis typically presents between 2 and 8 weeks of age and is treatable with surgery. The AAP also flags bile-stained (green or yellow) vomit in any infant as a red flag requiring immediate evaluation.

Certain Rashes

Newborn skin can be more temperamental than a teenager’s! Milia (tiny white bumps), baby acne, and erythema toxicum (splotchy red patches with small white or yellow centers) are all common and harmless in the first weeks. But call your pediatrician for any rash that:

• Is widespread or spreading rapidly
• Is accompanied by fever
• Looks like small purple or red dots that don't fade when you press on them (petechiae)—this can indicate a serious infection such as meningitis and warrants emergency care
• Looks like blisters or open sores

Lethargy or Extreme Difficulty Waking

Newborns spend most of their young life sleeping—as much as16 to 17 hours a day—but they should rouse relatively easily to feed and make eye contact when awake. The AAP identifies a baby who is unusually limp, unresponsive, or difficult to wake as showing a key warning sign that needs same-day evaluation. If your baby seems abnormally "out of it" or isn't responding the way they normally do, call your healthcare provider right away.

Signs of Dehydration

Newborns can become dehydrated more quickly than older children, and the warning signs can be subtle. The AAP advises calling your pediatrician immediately if you notice:

• No wet diapers in eight or more hours
• Dark yellow or orange urine
• Dry mouth and no tears when crying
• Sunken fontanelle (the soft spot on top of the head appears sunken rather than flat)
• Unusual lethargy or irritability

When to Call 911 or Go to the ER Immediately

Some symptoms require emergency care without waiting to reach your pediatrician:

• Baby has stopped breathing or breathing is very labored
• Baby is turning blue around the lips or fingernails
• Baby is unresponsive or unconscious
• Baby is having a seizure (repetitive jerking movements, stiffening, eyes rolling back)
• Baby under 2 months has a rectal temperature of 100.4 degrees Fahrenheit or higher and you cannot immediately reach your pediatrician
• Baby has bile-stained (green or yellow) vomit
• Baby has a purple or red pinpoint rash that doesn't fade when pressed

The Bottom Line

Your gut is one of the most powerful tools in your parenting toolkit. No one knows your baby better than you, and no question is too small to bring to your pediatrician. During the newborn period especially, it is always better to call and be reassured than to wait and worry. Keep your pediatrician's after-hours number somewhere easy to find, and don't hesitate to use it.

More on Your Baby’s Health:

• Well-Child Visits: What to Expect and When
• Childhood Illness Guide
• Baby Eczema: Causes, Symptoms, and Treatments
• Vaccine Guide and Baby Immunization Schedule

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Disclaimer: The information on our site is NOT medical advice for any specific person or condition. It is only meant as general information. If you have any medical questions and concerns about your child or yourself, please contact your health provider.