When is it “normal” for a baby to sleep badly?

Night wakings are normal throughout the first year (and beyond). It’s an expected pattern if the baby feeds, gains weight and is content during the day. What is worth reviewing is sustained bad sleep that exhausts the whole family: it almost always has an identifiable cause.

Where do I start if everything is wrong at once?

In this order: 1) their age’s wake windows, 2) bedtime (not too late), 3) environment (darkness and white noise), 4) a stable pre-sleep routine. That quartet solves most cases without touching anything else.

Does tracking sleep really help?

Enormously. Sleep-deprived perception is treacherous: “they didn’t sleep at all” sometimes turns out to be 13 hours with 3 wakings. Real data tells you what to adjust and confirms whether a change is working.

When should I see a professional?

If there are physical symptoms (fever, loud snoring, breathing pauses, poor weight gain), if the baby is irritable during the day too, or if weeks go by with no improvement despite correct schedules and routine. Start with your paediatrician.

Siestita Guide

Baby won’t sleep: what’s going on and where to start

It’s 3 am, you searched “baby won’t sleep” and here you are. Breathe: in the vast majority of cases there’s a concrete cause, and it’s usually one of these seven.

1. The wake window doesn’t fit

The most frequent cause and the easiest to fix. Put them down too early and they’re not sleepy; too late and cortisol keeps them wired. Check their age’s window in the wake windows chart and adjust in 15-minute steps.

2. Accumulated overtiredness

A few days of short naps and rough nights build a sleep debt that shows up, paradoxically, as worse sleep. The way out: a few days of slightly shorter windows and earlier nights until they recover.

3. A sleep regression

If they slept well and suddenly stopped around 4, 8, 12 or 18 months, it’s probably a development-linked regression. They’re temporary and usually resolve on their own within 2–6 weeks.

4. Sleep associations that demand a repeat

If they only fall asleep in arms, in motion or while feeding, they’ll ask for the same at every night arousal (and there’s one every 45–60 minutes). It’s only a problem if it’s a problem for your family — and if so, it can be worked on gradually.

5. A pending nap transition

A schedule that falls apart, naps fighting each other, new crib resistance: they may need one nap fewer (or still one more). Check the typical transitions in the naps guide.

6. Environment with room to improve

Dawn light sneaking in, too hot or cold, irregular noise. From 3–4 months, true darkness and steady white noise make a surprising difference.

7. Physical discomfort

Teething, congestion, ear infections, reflux, allergies. If poor sleep comes with unusual crying, fever, feeding refusal or lasts weeks with no pattern, the first stop is the paediatrician, not a schedule tweak.

The links you’ll need

The wake windows chart by age (start here).
Your exact stage in baby sleep by age, with a sample schedule.
The sleep regressions, if chaos arrived overnight.
Nap transitions in the baby naps guide.
The bedtime routine, step by step.
And the wake windows calculator for today’s next nap.

One important note: this guide is informational. If your instinct says something is off beyond sleep, see your paediatrician — that’s what they’re there for.