This Childhood

0–3 months: what to expect with a newborn

Quick answer

FOUNDATION keeps the first three months small: safe sleep, feeding that's working, on-time newborn checkups and warm attention. Judge feeding by weight checks and diapers, give vitamin D if your baby gets any breast milk, follow up a hearing screen that needs it, plan for crying that won't stop, and know the few signs that mean don't wait.

What matters most in the first 3 months?

Chapter 2, A gentle beginning, starts from the idea that a newborn needs answering, not lessons. The book says you can't spoil a young baby by holding or comforting, and you don't need to fill every waking minute.

When the day feels chaotic, return to the next feed and the next safe sleep, with a cuddle in between.

What should you prepare and protect for a newborn?

Every sleep a safe sleep. For naps and nights, put your baby down on the back, on a firm, flat mattress covered by just a fitted sheet, in a sleep space that meets federal safety standards. If your baby nods off in a car seat, swing or carrier, move him or her to a flat sleep surface soon. Room-share on a separate surface for at least six months, and don't feed on a sofa or armchair if you might doze off. "None of this makes bed-sharing safe." Stop swaddling at the first signs of rolling, and don't let your baby overheat.

Feed the baby in front of you. Milk is the whole diet: breast milk, store-bought formula or both, with no added water, tea, juice, cereal or broth. Count diapers: the book expects 2 to 3 wet ones a day at first and 6 or more by the end of week one. Any breast milk at all means a daily 400 IU vitamin D supplement from the first days. A drop is not a milliliter, so check how much makes 400 IU and keep one product and one routine so nobody doubles a dose.

When someone else gives the bottle. Label expressed milk with the date, never refreeze thawed milk, and never microwave a bottle.

Formula runs on two clocks: two hours from when you prepare a bottle, and one hour from when the feed starts.

Hearing and eyes, early. The national goal the book gives is a hearing screen by one month, a full test by an audiologist by three months if needed, and early intervention by six months if hearing loss is found.

A “refer” result is not a diagnosis, but it does need follow-up.

A white pupil in a photo always needs a prompt eye check, so save the picture and show it.

You are the first conversation. Answer a look or a sound warmly, then pause so your baby gets a turn. At roughly two months, most babies watch faces, calm to your voice, smile back and make sounds other than crying; if not, tell your pediatrician and ask about a developmental screen. Tummy time starts the day you come home, in short, supervised spells, never as tummy sleeping.

Questions parents ask

When is a fever in a young baby urgent?

A baby three months old or younger with a rectal temperature of 100.4°F (38°C) or higher needs immediate medical assessment

Call your baby's clinician right away, at night too; if you can't reach anyone quickly, go to an emergency room. The book says not to give fever medicine before your baby is seen, and to use a rectal reading at this age.

Call 911 for breathing difficulty, blue or gray color, a seizure, or difficulty waking.

What if the crying won't stop and I feel close to losing it?

Newborns commonly cry one to four hours a day in total. Check the basics, then try holding and rocking; a baby who can't be comforted may be ill. If you're near your limit, lay your baby on the back in an empty crib or bassinet, leave the room to calm down, and look in every 5 to 10 minutes. Never shake a baby; the book warns it can cause blindness, brain damage or death.

If you fear you may hurt the baby and can’t get safe help, call 911.

Do I need to keep my newborn entertained?

No. A yawn or a look away can mean your baby needs a break.

A calm face and a familiar voice are plenty.

Sources

Selected from the source notes the book lists for this chapter and matched to the guidance above. The book treats its source notes as a reading guide, not proof of every sentence, and listing a source does not mean that organization has reviewed or vouched for FOUNDATION.

← Before birth · All stages · 3–6 months →

FOUNDATION by THIS CHILDHOOD is a personalized digital parenting book, delivered as a PDF and an EPUB, that runs from before birth to 18. About the book

A note from the book

This guide assumes a generally healthy, full-term child, and it’s general education, not medical care tailored to yours.

Prematurity, growth concerns, a disability, illness, allergy, a feeding difficulty or medication can change that plan. If one applies, the book says to ask your child's pediatrician or specialist what changes for your child. It also says research hasn't found a parenting formula that guarantees a particular outcome.

This book has not had independent clinical review.

Optional product analytics

With your permission, we use PostHog to understand how people find FOUNDATION and where they need help. We send a general label for how you arrived, such as search, social or an ad, and selected steps and actions. We do not send names, answers, photos, email addresses, page URLs, the page you came from or campaign names. PostHog also receives ordinary request metadata, such as your IP address and browser details. Session recording and automatic capture are off. Read our privacy notice.