The newborn period is the first 28 days after birth. Life can feel like a continuous loop of feeding, short stretches of sleep, diapers, and follow-up appointments while your baby adjusts to the world outside the womb. This US guide explains what is worth watching, which hospital screenings and early visits belong on the calendar, and which changes should never wait for the next routine checkup.

01

What can the first days with a newborn look like?

A newborn may sleep and feed around the clock, startle easily, clench their fists, turn their head toward touch, and settle when held. Sleep has no dependable day-night pattern yet. Head and neck control is still developing, so support your baby’s head every time you lift or carry them. Peeling skin, cool bluish hands or feet while the lips remain pink, and some early weight loss can occur; whether those changes are expected for your baby is judged alongside breathing, feeding, alertness, and the weight trend.

The first four weeks are not a milestone test. Eye contact, responses to sound, and smoother movements emerge gradually. Babies born early need an individualized discharge plan, and corrected age will matter for development later. Call your pediatrician if a response you had seen disappears, one side moves noticeably less, or your baby’s usual behavior changes and stays changed.

02

What happens at the first US newborn visit?

The American Academy of Pediatrics places the first office visit at 3–5 days of age and within 48–72 hours after discharge. Your hospital or pediatrician may arrange an earlier visit after early discharge, prematurity, significant jaundice, feeding difficulty, or concerning weight loss. The visit usually reviews the birth and discharge record, weight, jaundice, hydration, feeding, stools and urine, the umbilical cord, safe sleep, and how the family is coping.

Bring the discharge summary, immunization record, newborn-screening information, and a list of medicines or supplements. Note any change in feeding, wet diapers, color, breathing, or alertness before the appointment. The visit is not just a weigh-in: it checks that the transition home is going safely and that every time-sensitive screening has a clear result or follow-up plan.

03

Which newborn screenings should be completed?

US newborn screening normally includes a dried-blood-spot test, hearing screening, and pulse-oximetry screening for critical congenital heart defects. Blood-spot timing and the conditions included are set by each state, so the hospital paperwork and your state program are the right references. Pulse oximetry is generally performed at 24 hours or as late as possible before an earlier discharge. Screening identifies babies who need another test; an out-of-range result is not a diagnosis.

Before leaving the hospital, confirm which screenings were completed, whether any sample needs repeating, and who will call with results. If your baby did not pass the first hearing screen, that does not by itself mean hearing loss, but the repeat or diagnostic appointment should not be missed. Keep your phone number and address current with the hospital and state program so a time-sensitive result can reach you.

04

Vitamin K, vitamin D, and the hepatitis B decision

Vitamin K is normally given after birth to prevent vitamin K deficiency bleeding. In December 2025, CDC changed the hepatitis B recommendation for babies whose birth parent’s prenatal test is confirmed negative: parents and clinicians now make the timing decision together. If the birth parent tested positive or the result is unknown, the baby should still receive hepatitis B vaccine within 12 hours of birth and may also need hepatitis B immune globulin, a preparation containing ready-made protective antibodies. Record the plan actually chosen with your pediatrician rather than relying on an older chart.

AAP guidance includes 400 IU of vitamin D daily for infants younger than one year, but that is general guidance rather than a personalized dose for your baby. Product concentration, feeding, prematurity, and health history can change the plan. Ask your pediatrician which product and amount to use before starting or changing a supplement, and confirm any unclear hospital medication or immunization record with the care team.

05

How often should a newborn eat?

Newborns feed day and night, often in clusters. For breastfeeding families, offer the breast at early hunger cues such as rooting, bringing hands to the mouth, or turning toward touch rather than waiting for crying. WHO recommends exclusive breastfeeding for the first six months when possible. If you use infant formula, follow the mixing directions exactly and ask your pediatrician to plan amounts around gestational age, weight, growth, and health instead of a generic ounces-by-age chart.

No single feeding length or bottle volume proves intake. Audible swallowing, comfortable breathing during feeds, alert periods, wet-diaper pattern, and weight over time belong in the same picture. Call the pediatrician promptly if your baby is too sleepy to feed, cannot coordinate sucking and breathing, repeatedly vomits, or has a sharp drop in wet diapers.

06

How should a newborn sleep safely?

Newborn sleep is scattered across day and night, and there is no medically established minute-perfect wake-window schedule for the first 28 days. Whether your baby should be woken to feed depends on gestational age, jaundice, weight gain, and the pediatrician’s plan. Follow the discharge instructions instead of waiting for a newborn to sleep through the night.

Place your baby on their back for every sleep on a firm, flat, separate surface. Keep pillows, positioners, bumpers, toys, and loose bedding out of the sleep space. Room-sharing without bed-sharing is recommended for at least the first six months. Car seats and other sitting devices are for travel, not routine sleep; move a sleeping baby to the safe sleep surface when the trip is over. Falling asleep with a baby on a couch or armchair is especially dangerous.

07

What should you watch in jaundice, stools, and wet diapers?

Jaundice is common, but skin color alone cannot tell you the bilirubin level. Yellowing in the first 24 hours, yellowing that spreads or deepens, difficulty waking, poor feeding, dark urine, or pale/chalky stools needs prompt medical advice. Keep every bilirubin recheck even if your baby looks better; sunlight through a window is not a substitute for measurement or prescribed phototherapy.

Stool appearance and diaper frequency change quickly in the first days. Use your baby’s age, feeding method, and weight trend rather than one internet number as the only cutoff. A sharp decline from the usual wet-diaper pattern, no urine for 12 hours, blood in the stool, persistent diarrhea, or vomiting with a swollen abdomen needs urgent assessment.

08

How do you care for the cord and newborn skin?

Keep the umbilical stump clean and dry, fold the diaper below it, and avoid powders, oils, alcohol, or home remedies unless your maternity team gave a specific instruction. Let it separate on its own. Call the pediatrician the same day for redness spreading onto the abdomen, swelling, pus, bad odor, fever, or bleeding that will not stop.

Mild peeling and small temporary rashes are common on newborn skin. Gentle washing, careful drying, and fragrance-free products are usually enough. Blisters, oozing, a rapidly spreading rash, or a rash accompanied by a change in feeding or alertness should be assessed rather than treated by trying multiple products at home. Blue or gray lips or skin with a breathing change is an emergency.

09

When should you call for help right away?

A rectal temperature of 100.4°F (38°C) or higher in a baby under three months means calling the pediatrician immediately; do not give fever medicine unless the clinician tells you to. Call 911 for severe breathing difficulty, blue or gray lips or skin, a seizure, or an unresponsive baby.

Seek urgent medical care for grunting or chest retractions, a baby who cannot be woken to feed, repeated or green vomit, no urine for 12 hours, rapidly worsening jaundice, spreading redness around the cord, or a baby who looks distinctly unlike themselves. Your recognition that something has changed is useful medical information even when the symptom is not on a checklist.

Your newborn’s whole first month, in one app

Nerumi turns sleep history into personal predictions; brings nursing, bottles, pumping, milk inventory, diapers, and medicines into one timeline; charts growth on WHO percentiles; and keeps immunizations, screenings, appointments, questions, and first memories together. Export any date range as a polished pediatrician PDF. No Nerumi account is required, and your baby’s data stays in your own iCloud.

Explore NerumiApp Store↗

This app doesn't give medical advice; if you're worried, talk to your pediatrician.