Newborn Health Symptoms: What’s Normal, What’s Not, and When to Call

By Drew February 14, 2026 2 min read

In the first weeks, every weird sound, odd-colored poop, and slightly yellow cheek sent me spiraling. I needed a reference — not WebMD doom-scrolling, but actual clinical guidance on what’s normal, what’s worth watching, and what means “call now.” Here’s my summary.

Jaundice: Common but Worth Watching

A little jaundice — yellow skin or yellow eyes — is common in newborns. The AAP’s 2022 jaundice guideline focuses on prevention, monitoring, and treatment. MedlinePlus explains it happens when bilirubin builds up in the blood, and notes that bilirubin is often highest around day 3 to day 5.

Those early days are especially important for watching skin color and making sure feeding is going well (good feeding helps flush bilirubin). If the yellow is spreading, deepening, or the baby seems lethargic, that’s a call-your-doctor moment.

Red Flags: Don’t Wait and See

Stanford Children’s says these signs warrant an immediate call:

In a newborn, none of these are “wait and see” situations.

Subtler Signs to Watch For

Stanford Children’s also lists signs that are easier to miss: not urinating, no bowel movement for 48 hours, worsening jaundice, vomiting that’s yellow or green, poor appetite, weak sucking, and crying that doesn’t improve with comfort.

MedlinePlus says the cord stump should be watched too — foul-smelling drainage, redness, swelling, tenderness, or ongoing bleeding are reasons to call.

Trust Your Gut

Stanford Children’s literally says to trust your knowledge of your child and call if you see worrying signs. That’s a children’s hospital telling you that “something just seems off” is a valid reason to call.

My tip: take a photo of the jaundice, write down feeds and diapers, and note when fever or vomiting started. It makes the conversation with your pediatrician much more productive.


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