Your baby was born early. Your calendar should know that.
Development runs on the due-date clock, not the birth-date clock. Pediatricians call it
adjusted age, and they use it until around age 2. Every tool and every guide on this
page is built on that calendar — the one that is fair to babies born early.
See where your baby really is
Enter the birth date and the due date, and the forecast maps the whole first year on your baby's adjusted age. Free, no signup, stays on your device.
Should I count from the birth date or the due date?
For development — rolling, smiling, sitting, fussy phases — count from the due date. For vaccines and most medical schedules, doctors usually use the birth date. When in doubt, ask your pediatrician which clock applies.
Is my baby behind?
Measured on adjusted age, most preemies are exactly where they should be. Comparing a baby born 8 weeks early against full-term babies of the same birth date is comparing two different calendars. If milestones are missing on adjusted age, that is the moment to talk to your doctor — and your own concern is always reason enough to call.
Do fussy phases follow adjusted age too?
Yes. Even the original 1992 research counted from the due date, not the birth date. That is why our forecast asks for both dates and does the adjusting for you.
Written to be readable at 3 a.m., checked against CDC, AAP and NHS guidance, with every source
cited on each page. Not medical advice: for anything that worries you, your care team knows
your baby best.
Peanutbean provides general information for educational purposes only. It is not medical advice.
Every baby develops at their own pace. Always talk to your pediatrician about your child's health.
What's going on?
Struggling to breathe, blue or grey lips, a seizure, or unresponsive?
Call emergency services right now (911 in the US, 999 in the UK). Don't keep browsing.
Won't stop crying
Most crying jags pass. If it happens most days, in long stretches, especially evenings, that's often colic, and it is not something you caused. A quiet, dim room and slow rocking help more than trying something new.
Tested & works
The 5 S's, in order: snug swaddle, hold on their side in your arms, shush as loudly as they cry (or white noise), small fast jiggles, then something to suck. Used together they calm most crying babies within minutes.
100.4F / 38C or higher counts as a fever. Under 3 months with any fever: call your doctor now. Older babies who are still feeding and settling usually just need home care and watching, but your own concern is reason enough to call.
Tested & works
Dose paracetamol or ibuprofen by your baby's weight, not their age — it's the single most common dosing mistake. And don't bundle them up: one light layer helps the fever do its job.
Frequent night waking is normal for most of the first year. It is not a sign you are doing something wrong. A short, calm routine tends to help more than a long, elaborate one.
Tested & works
The same 3 steps, same order, every night (bath, feed, song), then into the cot drowsy but awake. In clinical trials this simple routine measurably improved infant sleep within 2 weeks.
Spitting up after feeds is common and usually harmless. It is worth a closer look if it is forceful, happens after most feeds, or your baby seems uncomfortable.
Tested & works
Keep your baby upright against your shoulder for 20–30 minutes after each feed, and try smaller, more frequent feeds. These two changes alone settle most spit-up — no wedges or thickeners needed.
Most baby rashes are mild and clear on their own. Dry, itchy patches are often eczema, which usually eases with simple changes long before it is something to worry about.
Tested & works
Soak and seal: a short lukewarm bath, pat (don't rub) mostly dry, then a thick fragrance-free emollient within 3 minutes, every day. It's the best-proven home treatment for baby eczema.
A red face and straining is not constipation if the poo comes out soft. Real constipation means hard, dry, pellet-like poo. More milk feeds (or cooled boiled water for formula-fed babies) usually help; see a GP early for a young baby.
Tested & works
Bicycle their legs gently and massage the tummy clockwise for a few minutes, a couple of times a day. On solids? The 3 P fruits — prunes, pears, peaches — are the proven natural laxatives for babies.
Sore gums, drooling and chewing on everything are classic signs, and they can start well before or after the average 6 months. Teething does not cause a real fever (38C/100.4F or higher) — look for another reason if your baby has one.
Tested & works
A chilled (not frozen) solid rubber teether, or a clean wet washcloth from the fridge to chew on. Skip numbing gels and amber necklaces — regulators warn against both.
A yellow tint in the first week is common and usually harmless, peaking around day 3. Get medical help promptly if it appears in the first 24 hours, or if your baby is hard to wake, feeding poorly, or has dark pee or pale poo.
Tested & works
Feed early and often — 8 to 12 feeds in 24 hours. Milk is what flushes bilirubin out, so frequent feeding is the proven way to help mild jaundice clear faster. Sunlight through a window is not a treatment.
Not knowing what to do is not failing. Every parent learns this on the job. Put the baby down somewhere safe, take two minutes for yourself, and come back when you feel steadier.
Tested & works
Crying never harms a baby — but shaking can. Baby safe on their back in the cot, door closed, 10-minute timer in another room. Pediatricians teach this exact routine because it works when nothing else does.
Wanting to be held is biology, not a bad habit — young babies can't be spoiled. It eases as they grow. Meanwhile, a snug swaddle (before rolling age) and white noise recreate some of that held feeling in the cot.
Tested & works
The tested transfer: carry your baby while walking for 5 minutes, then sit and hold them still for 5–8 more before laying them down feet-first, keeping a hand on their chest. Researchers found this sequence dramatically cuts wake-on-put-down.
Fussy, cluster-feeding, inconsolable from about 5 to 11 p.m.? That's the witching hour. It peaks around 6 weeks and fades by 3–4 months. It is normal, and it is not your milk or your parenting.
Tested & works
Get ahead of it: dim lights and lower the noise an hour before the usual meltdown, offer cluster feeds without watching the clock, and go for a walk with the baby in a carrier — motion plus your heartbeat is the most reliable evening reset.
Newborns are loud sleepers: grunting, squirming, even brief red-faced straining are usually just active sleep and an immature gut, not pain. It typically fades by 3–4 months.
Tested & works
The pause: when you hear grunting, wait a few minutes before picking up. Most babies are still asleep and will resettle — scooping them up mid-cycle actually wakes them. Get help if grunting comes with every breath, fever, or blue lips.
