When can my baby get the flu shot, and how many doses?

The flu vaccine is recommended yearly for everyone 6 months and older, so a baby can get it starting at 6 months. If it is the first time your baby is being vaccinated against flu, the AAP recommends two doses given four weeks apart; this also applies if your baby received only one dose ever before July 1 of the previous year. A baby who has been vaccinated in a past season usually needs only one dose. Sooner is better, so aim to have the dose, or both doses, completed before flu spreads in your area.

How do I protect a baby who is too young for the flu vaccine?

A baby under 6 months is too young for the flu vaccine, so you build protection around them. Vaccinate everyone who lives with or cares for the baby, since fewer infected people nearby means lower exposure. Flu vaccination during pregnancy passes antibodies to the baby in the womb, and antibodies also pass through breastmilk if you are vaccinated and nursing. Keep anyone with cough, fever, or cold symptoms away until they recover, wash hands before holding the baby, and avoid crowds during peak season.

What RSV signs mean I should call the doctor?

RSV often starts like a cold but can move into the lungs, and it is the most common cause of hospitalization in children under age 1. Call your pediatrician right away, and seek emergency care, if your baby is breathing fast or working hard to breathe, has the skin tugging in between or under the ribs, is flaring the nostrils or grunting with each breath, is wheezing, looks pale, gray, or blue in the skin, lips, or nail beds, has pauses in breathing, has fewer than one wet diaper every 8 hours, or is much less alert than usual.

How do I help my baby adjust when the clocks fall back an hour?

Start about a week before the change and nudge naps and bedtime a few minutes each day, roughly 10-15 minutes, shifting the whole routine including wake time and feeds. Get your baby into natural daylight during the day, since sunlight helps reset the internal clock, and keep the room dark at sleep times. Hold a steady wind-down routine. Most children adjust within about a week. Do not give a baby melatonin; if sleep stays disrupted for more than a couple of weeks, talk with your pediatrician.

My baby has a fever this fall. When is it urgent?

For a baby younger than 3 months, a rectal temperature of 100.4°F (38°C) or higher means call your pediatrician immediately, even if your baby seems fine otherwise, because a young baby's fever must be checked for serious infection. From 3 to 6 months, call for 101°F (38.3°C) or higher; over 6 months, call for 103°F (39.4°C) or higher. At any age, call 911 or go to the ER if your baby is struggling to breathe, turns blue or gray, is limp, or is very hard to wake.

How should I dress my baby for cool, changeable fall weather?

Use the one-more-layer rule: dress your baby in one more thin layer than an adult would wear in the same conditions, plus a hat and mittens, so you can add or remove layers as the day changes. In the car seat, use thin snug layers rather than a bulky coat, which compresses under the harness and leaves it too loose; tuck a blanket over the buckled harness instead. For sleep, skip loose blankets and use a wearable blanket or one-piece sleeper. Check warmth at the chest or back of the neck, not the hands and feet.

Fall · Infant 0–12 mo

Fall Baby Care: Flu Shots, RSV, and the Sleep Shift

Fall brings four things at once for a baby under one: flu and RSV season, the clocks falling back an hour, cooler swings in the weather, and dry indoor air. Here is what to do for each.

This is a planning guide for babies 0-12 months. It covers the flu vaccine and how to protect a baby too young for it, RSV and the breathing signs that mean call right away, how to ease the daylight saving time change, dressing for cooler variable days, back-to-daycare germ exposure, and dry skin from indoor heat. Vaccine timing, fever thresholds, and the red flags below are grounded in current AAP guidance. None of this replaces your pediatrician's advice for your baby.

7 min read Fall Updated June 2026

Reviewed against current AAP and CDC guidance

Flu vaccine: who gets it, and how to protect a baby who can't

Baby is 6 months or older

Your baby can and should get the flu vaccine. The AAP recommends it yearly for everyone 6 months and up.
First time ever vaccinated: two doses, given four weeks apart. This also applies if your baby got only one dose ever before July 1 of the previous year.
Already vaccinated against flu in a past season: one dose this year is usually enough.
Sooner is better. Aim to have the dose, or both doses, in before flu spreads in your area.

Baby is younger than 6 months

Vaccinate everyone who lives with or cares for the baby. Fewer infected people near the baby means lower exposure.
Flu vaccination during pregnancy passes antibodies to the baby in the womb. Antibodies also pass through breastmilk if you are vaccinated and nursing.
Ask anyone with cough, fever, or cold symptoms to stay away until they are well.
Wash hands before holding the baby and keep the baby out of crowds during peak season.

A baby under 6 months is too young for the flu vaccine, so the goal is to build a protective cocoon around them.

RSV: the other fall-winter respiratory virus

RSV is a common respiratory virus that spreads like a cold, through contact with infected saliva, mucus, or nasal discharge, usually entering through the nose or eyes. It typically circulates from late fall through early spring, though timing varies by region. For most babies it looks like a bad cold, but it is the most common cause of hospitalization in children under age 1, because their small airways swell easily. There is an RSV immunization for infants: a single injection (nirsevimab) given at the hospital around birth or at the first checkup for babies under 8 months during RSV season, shown to be about 80-90% effective at preventing RSV hospitalization. Ask your pediatrician whether your baby is a candidate and when to give it relative to the season.

RSV and breathing trouble: call your pediatrician now

Fast breathing, or working hard to breathe
The skin tugging in between or under the ribs with each breath (retractions), or belly breathing
Flaring nostrils, head bobbing with breathing, or rhythmic grunting
Wheezing
Pale, gray, or blue color in the skin, lips, or nail beds
Pauses in breathing or difficulty breathing
Fewer than one wet diaper every 8 hours, or other signs of dehydration
Significantly less activity and alertness than usual

Fever rules and when it is an emergency

Call 911 or go to the ER if your baby is struggling to breathe, turns blue or gray, is limp, or is very hard to wake.
Younger than 3 months: a rectal temperature of 100.4°F (38°C) or higher means call your pediatrician immediately, even with no other symptoms. The doctor needs to examine your baby to rule out serious infection.
3 to 6 months: call your pediatrician for a temperature of 101°F (38.3°C) or higher.
Over 6 months: call for a temperature of 103°F (39.4°C) or higher, or a fever that lasts more than a couple of days or comes with poor feeding, fewer wet diapers, or unusual sleepiness.

Daylight saving ends: easing the sleep shift

Start about a week before

Begin nudging naps and bedtime a few minutes each day in the direction the clock will change. Small steps of roughly 10-15 minutes per day are gentle on a baby.
Shift the whole routine together: wake time, naps, feeds, and bedtime, not just lights-out.

Use light to reset the clock

Get your baby outside in natural daylight during the day. Sunlight has a strong effect on the body's circadian rhythm and helps reset it after a time change.
Keep the room dark and calm at sleep times so the new schedule sticks.

Keep the routine steady

Hold a predictable pre-sleep routine through the change.
Do not give a baby melatonin. If sleep problems continue past a couple of weeks, talk with your pediatrician before trying anything.

If it is bumpy for a few days, that is expected. A consistent wind-down routine signals that it is time to sleep, and most children settle within a week.

Dressing for cooler, variable fall days

Situation	What to do
General cool weather	Several thin layers, plus a hat and mittens. Add or remove layers as the day warms or cools.
In the car seat	Thin, snug layers, not a thick bulky coat or snowsuit. A puffy coat compresses under the harness and leaves it too loose. Tuck a blanket over the buckled harness for warmth instead.
At sleep	No loose blankets, quilts, pillows, or bumpers in the crib. Use a one-piece sleeper or a wearable blanket for warmth.
Checking if baby is warm enough	Feel the chest or back of the neck, not hands and feet, which run cool normally. Overheating is a risk too, so do not over-bundle indoors.

Back to daycare: managing the germ season

Keep your baby home for a fever above 101°F (38.3°C) plus a change in behavior or other symptoms (such as cough, sore throat, rash), for vomiting two or more times in 24 hours, or for diarrhea above their normal pattern.
Return to care once the fever tied to those symptoms has been gone for at least 24 hours without fever-reducing medicine.
Keep your baby home for any difficulty breathing and have it checked.
Wash your hands, and have caregivers wash theirs, before feeding or handling the baby. Keep the flu vaccine current for everyone in the household.

Dry indoor air and skin

Keep baths short, about 5-10 minutes, in lukewarm water. Hot water dries the skin.
Use a fragrance-free, hypoallergenic non-soap cleanser instead of harsh soap, and skip bubble bath.
Apply moisturizer to the whole body right after the bath while the skin is still damp, once or twice a day.
Run a humidifier to add moisture to dry heated air, and clean it regularly to prevent mold.
Choose soft cotton clothing and bedding, and wash with a fragrance-free detergent.

Quick answers

When can my baby get the flu shot, and how many doses?: The flu vaccine is recommended yearly for everyone 6 months and older, so a baby can get it starting at 6 months. If it is the first time your baby is being vaccinated against flu, the AAP recommends two doses given four weeks apart; this also applies if your baby received only one dose ever before July 1 of the previous year. A baby who has been vaccinated in a past season usually needs only one dose. Sooner is better, so aim to have the dose, or both doses, completed before flu spreads in your area.
How do I protect a baby who is too young for the flu vaccine?: A baby under 6 months is too young for the flu vaccine, so you build protection around them. Vaccinate everyone who lives with or cares for the baby, since fewer infected people nearby means lower exposure. Flu vaccination during pregnancy passes antibodies to the baby in the womb, and antibodies also pass through breastmilk if you are vaccinated and nursing. Keep anyone with cough, fever, or cold symptoms away until they recover, wash hands before holding the baby, and avoid crowds during peak season.
What RSV signs mean I should call the doctor?: RSV often starts like a cold but can move into the lungs, and it is the most common cause of hospitalization in children under age 1. Call your pediatrician right away, and seek emergency care, if your baby is breathing fast or working hard to breathe, has the skin tugging in between or under the ribs, is flaring the nostrils or grunting with each breath, is wheezing, looks pale, gray, or blue in the skin, lips, or nail beds, has pauses in breathing, has fewer than one wet diaper every 8 hours, or is much less alert than usual.
How do I help my baby adjust when the clocks fall back an hour?: Start about a week before the change and nudge naps and bedtime a few minutes each day, roughly 10-15 minutes, shifting the whole routine including wake time and feeds. Get your baby into natural daylight during the day, since sunlight helps reset the internal clock, and keep the room dark at sleep times. Hold a steady wind-down routine. Most children adjust within about a week. Do not give a baby melatonin; if sleep stays disrupted for more than a couple of weeks, talk with your pediatrician.
My baby has a fever this fall. When is it urgent?: For a baby younger than 3 months, a rectal temperature of 100.4°F (38°C) or higher means call your pediatrician immediately, even if your baby seems fine otherwise, because a young baby's fever must be checked for serious infection. From 3 to 6 months, call for 101°F (38.3°C) or higher; over 6 months, call for 103°F (39.4°C) or higher. At any age, call 911 or go to the ER if your baby is struggling to breathe, turns blue or gray, is limp, or is very hard to wake.
How should I dress my baby for cool, changeable fall weather?: Use the one-more-layer rule: dress your baby in one more thin layer than an adult would wear in the same conditions, plus a hat and mittens, so you can add or remove layers as the day changes. In the car seat, use thin snug layers rather than a bulky coat, which compresses under the harness and leaves it too loose; tuck a blanket over the buckled harness instead. For sleep, skip loose blankets and use a wearable blanket or one-piece sleeper. Check warmth at the chest or back of the neck, not the hands and feet.

Sources & further reading

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This guide reflects current AAP and CDC guidance and is for educational purposes only. It does not constitute medical advice. ParentFlow is a wellness companion — not a substitute for your pediatrician. For any medical concern, contact your healthcare provider.