The Newborn: Birth to 4 Weeks

📚 What this guide covers

Why the newborn period is biologically extraordinary

What your newborn can see, hear, and feel from birth

Skin-to-skin contact — the evidence and the practice

Feeding in the first weeks — breast, formula, and demand feeding

Sleep — what is normal and what safe sleep looks like

What is normal newborn behaviour

Your checks and appointments in week one

Supporting yourself — the parent behind the parent

The Most Extraordinary Thing a Human Can Do

Your baby has just arrived from the only world they have ever known. For nine months they experienced constant warmth at 37 degrees, the muffled sound of your heartbeat at around 70 beats per minute, the physical containment of the womb, zero-gravity movement, and on-demand nutrition delivered without effort. They have never been cold. Never been hungry. Never experienced the weight of air on their skin or the brightness of light in their eyes.

The newborn period — the first four weeks — is the period in which your baby begins the extraordinary work of adjusting to the outside world. It is also, for most parents, one of the most physically and emotionally intense experiences of their lives. This guide is for that period: what is happening, what your baby needs, what to expect, and how to survive it.

What Your Newborn Can Already Do

Newborns are far more capable than they appear. Their helplessness is physical — they cannot hold their head, roll, or move independently — but their sensory and social capacities are immediately active.

Vision

20–30cm focus distance

Newborns can see clearly at 20–30cm — precisely the distance to your face when feeding. They are drawn to high-contrast patterns and faces above all else. This is not a coincidence.

Hearing

Recognises your voice from birth

Your baby has been hearing your voice since approximately 18 weeks of gestation. They recognise it at birth and preferentially orient toward it. Research shows newborns can even distinguish the language spoken during pregnancy from other languages.

Smell

Identifies you by scent

A newborn can identify their mother's breastmilk — and their mother — by smell within hours of birth. This olfactory recognition is one of the mechanisms underpinning the early attachment bond.

Touch

Most sensitive sense from birth

Touch is the most developed sense at birth. Your baby is sensitive to pressure, temperature, and texture from the first moment. Skin-to-skin contact activates a cascade of physiological responses that support their stability.

Reflexes

Present and purposeful

Rooting (turning toward touch on the cheek), sucking, grasping, and the Moro startle reflex are all present at birth. They are primitive neurological responses — the scaffolding on which voluntary control will be built.

Social response

Preferential attention to faces

Within hours of birth, newborns show preferential attention to face-like patterns over other stimuli. They are, from the very first day, oriented toward the social world that will shape their development.

"I had been told he would not really respond for weeks. But from day one he turned toward my voice. When I picked him up he went quiet. When I spoke he went still and looked for me. I had not expected to feel so immediately known."

From the NCT community · day three postpartum

Skin-to-Skin Contact

Skin-to-skin — holding your naked baby against your bare chest — is the single most evidence-supported intervention in the newborn period. Its effects are physiological, not merely emotional, and they extend well beyond the birth room.

✓

Temperature regulation. A newborn cannot maintain their own body temperature. Your chest is a biologically calibrated thermostat — it adjusts its own temperature in response to your baby's, warming if they cool and cooling if they overheat. No incubator replicates this precision.

✓

Breathing and heart rate stability. Skin-to-skin reduces apnoea (breath-holding) in newborns and stabilises heart rate. The rhythmic sound and movement of your breathing acts as a regulatory stimulus for their own respiratory pattern.

✓

Blood glucose. Newborns are prone to hypoglycaemia (low blood sugar) in the first hours after birth. Skin-to-skin stabilises blood glucose more effectively than blankets, incubators, or formula supplementation in healthy term babies.

✓

Breastfeeding establishment. Skin-to-skin triggers the crawling reflex — an instinctive movement toward the breast — and stimulates feeding hormones in both mother and baby. Early skin-to-skin is associated with longer breastfeeding duration.

✓

Cortisol reduction. Birth is a cortisol-flooding event for your baby. Skin-to-skin with a parent — either parent — measurably reduces cortisol in newborns within minutes. The calming effect is not incidental. It is biological.

Partners and skin-to-skin

The benefits of skin-to-skin are not exclusive to the birthing parent. Partners holding a newborn skin-to-skin provide the same physiological stabilisation and stimulate their own bonding hormones in the process. In situations where the birthing parent cannot hold their baby immediately — after a general anaesthetic caesarean, for example — a partner doing skin-to-skin is not a substitution. It is the right thing.

Feeding in the First Weeks

Feeding is the central activity of the newborn period in terms of time, complexity, and often emotional weight. Whatever method you are using, the most important truth is this: your baby needs to eat, frequently, on demand. Everything else is secondary.

How often

Newborn stomachs are the size of a marble at birth and can hold only small amounts. Demand feeding — feeding whenever your baby shows hunger cues (rooting, hand-to-mouth movements, stirring, increased alertness before crying) — is the biological norm for the first weeks. This typically means 8–12 feeds in 24 hours, with some babies feeding more frequently. Crying is a late hunger cue — feeding before they reach crying is easier for everyone.

Breastfeeding in the first week

Colostrum — the thick, yellow first milk — is present from around 16 weeks of pregnancy and is available for your baby from birth. It is produced in small amounts, which precisely matches the capacity of your newborn's stomach. Mature milk typically comes in between days 2 and 5, often accompanied by breast fullness and engorgement. Feeding frequently in these first days is what drives supply — this is not optional if you want to establish breastfeeding.

If breastfeeding is painful, something is wrong and something can be done about it. Contact your midwife, health visitor, or the National Breastfeeding Helpline (0300 100 0212) before giving up.

Formula feeding

Formula-fed babies in the first weeks typically take 30–60ml per feed initially, increasing to around 90ml by the end of the first week. Responsive formula feeding — following hunger cues rather than strictly timing feeds — is endorsed by UNICEF Baby Friendly and provides the same relational benefits as breastfeeding on demand.

Signs feeding is not going well — contact your midwife

Fewer than 6 wet nappies per day after day 5 · Stools not transitioning from dark meconium by day 3–4 · Your baby not regaining birth weight by 2 weeks · Feeding that is consistently painful · Your baby seeming very drowsy and difficult to wake for feeds

Sleep in the Newborn Period

Newborns sleep between 14 and 18 hours in 24, but rarely for more than 2–4 hours at a stretch. Their sleep is not distributed in the day-and-night pattern that adults experience — this circadian rhythm develops over the first weeks and months, helped by exposure to natural daylight during awake periods and a calm, low-light environment at night.

Waking frequently to feed is not a sleep problem. It is biological necessity — your baby's stomach cannot hold enough to last longer, and their neurological system is not yet capable of sustaining longer sleep independently. The question of how to survive it is real; the question of how to fix it is premature.

Safe sleep — non-negotiable from day one

Back to sleep, every time. Placing your baby on their back to sleep is the single most important factor in reducing sudden infant death. For naps and at night, every time, without exception.

Firm, flat surface. Moses basket, cot, or bedside crib with a firm, flat mattress. No padding, bumpers, pillows, or loose bedding in the sleep space.

Room-share for at least 6 months. Keeping your baby in your room — but not in your bed — for the first six months is recommended by the Lullaby Trust and reduces the risk of SIDS.

Never on a sofa or armchair. The risk of sudden infant death is significantly elevated when a baby falls asleep on a sofa or armchair with a sleeping parent. If you are very tired while feeding, be aware of this risk.

Smoke-free environment. Exposure to cigarette smoke — including through clothing and bedding — is an independent risk factor for SIDS, separate from and in addition to the risks of smoking during pregnancy.

What Is Normal Newborn Behaviour

Grunting and snuffling

Newborns are obligate nose breathers and their nasal passages are tiny. A small amount of mucus causes significant noise. This does not indicate illness or distress — it is anatomy.

Moro reflex (startling)

A sudden full-body startle — arms flung wide, then pulled in — triggered by sudden sound or movement. Present from birth, it fades by 3–6 months. It is a primitive neurological reflex, not a sign of distress.

Irregular breathing

Periodic breathing — alternating faster and slower breaths with brief pauses — is normal in newborns. Contact your midwife if any pause lasts longer than 20 seconds or is accompanied by a colour change.

Blue hands and feet

Bluish hands and feet (acrocyanosis) in the first 24–48 hours is normal — the circulatory system is still adapting. Blue lips or central cyanosis (around the mouth and chest) is not normal — call 999.

Weight loss in week one

Most newborns lose 5–10% of birth weight in the first few days as they pass meconium and adjust to feeding. They should regain birth weight by 2 weeks. More than 10% loss warrants attention.

Jaundice

Mild yellow skin colouring, appearing from day 2–3 and peaking around day 4–5, is physiological jaundice — very common and usually resolves by two weeks. Jaundice appearing in the first 24 hours or persisting beyond 2 weeks needs assessment.

Call 999 or go to A&E — do not wait

Temperature above 38°C in a baby under 3 months (always urgent) · Blue lips or central cyanosis · Difficult or rapid breathing · Fitting or seizure · Unresponsive and difficult to wake · A rash that does not fade under pressure (glass test)

Your Checks and Appointments in Week One

→

Newborn physical examination — within 72 hours of birth. Checks hips, heart, eyes, and testes (if applicable). Usually performed by a paediatrician or specialist midwife. A second examination at 6–8 weeks by your GP.

→

Newborn blood spot screening — day 5. A heel prick test that screens for 9 rare but serious conditions including PKU, congenital hypothyroidism, and sickle cell disease. Decline only after genuinely informed discussion.

→

Newborn hearing screening — usually before leaving hospital or within the first few weeks. An automated test using small earphones; your baby can be asleep during it.

→

Midwife visits — at least 3 visits in the first 10 days: day 1, day 3, and day 10 (or until feeding is established and weight is recovering). Contact them between visits if you are concerned about anything.

→

Vitamin K — offered immediately after birth to prevent Vitamin K Deficiency Bleeding, a rare but potentially serious condition. Available as a single injection or as oral drops across multiple doses. The injection is more reliable.

You: The Parent Behind the Baby

Almost everything in the newborn period is focused on the baby. This is appropriate — they cannot advocate for themselves and their needs are immediate. But you are also going through something extraordinary, and your experience matters both for its own sake and for theirs.

What you are physically recovering from

Whether you had a vaginal birth or a caesarean, your body has undergone something significant. Rest — genuinely, not just strategically — is the single most important thing you can do for your physical recovery. This is harder than it sounds with a newborn, but the advice to sleep when baby sleeps exists because it is true, not because it is easy.

The baby blues

Roughly 80% of people who give birth experience the "baby blues" — a period of tearfulness, emotional lability, and low mood typically appearing on days 3–5 and resolving within 2 weeks. It is driven by the dramatic hormonal shift that follows birth and is not postnatal depression. It does not need treatment; it needs rest, support, and the knowledge that it passes.

If low mood persists beyond two weeks, intensifies rather than easing, or is accompanied by difficulty bonding, intrusive thoughts, or feeling unable to cope — speak to your midwife or GP. Postnatal depression is common, treatable, and not a reflection of how much you love your baby.

"Nobody told me about the baby blues. Day four, I just cried for eight hours. I was convinced I had made a terrible mistake. My midwife came and sat with me and explained what was happening hormonally and I felt — not better exactly, but less terrified. It passed by the end of the week."

From Tommy's parent community · four days postpartum