When should a baby's first tooth appear,

Tonight: swap the gum-checking for one 10-minute comfort-and-log routine, and put a first dental visit on the calendar dated before your baby's 12-month mark — that visit is the real deadline for this worry, not tonight's thermometer.

The timing you asked for

Most babies start teething at around 6 months, but others start before 4 months, some after 12 months, and a few are born with a tooth. NHS puts it this way: "your baby will probably get their first tooth some time during their first year." (NHS, checked 5 Nov 2026 — nhs.uk/baby/babys-development/teething/baby-teething-symptoms/)

Bottom teeth usually come through before the matching top ones, and most children have all 20 milk teeth by age 2–3. (NHS, checked 5 Nov 2026 — same page)

When is late too late?

NHS advice: "Take your child to the dentist when their first milk teeth appear, or before they are 12 months old." (NHS, checked 5 Nov 2026 — nhs.uk/live-well/healthy-teeth-and-gums/taking-care-of-childrens-teeth/)

• First tooth has appeared → book the first dental visit now, and start brushing as soon as it breaks through: you brush, twice a day, with a baby brush and a tiny smear of fluoride toothpaste, spitting out if they can, no rinsing needed.
• Still no tooth at the 12-month mark → that is still inside the range NHS describes (some babies start after 12 months), but it is exactly the point where the dental or child check is due anyway, so it gets looked at rather than watched. The uncommon reasons a first tooth is late (nutrition, hormones, genetics) are a clinician's job to find, not yours to guess at.

1) What you have already tried, and the better version of it

"Checking the gums during teething" — keep the looking, shrink it. One two-minute look at bath time is enough. What a tooth on its way looks like: a raised, whitish ridge on the lower front gum, sometimes a swollen red spot, more dribbling, a flushed cheek. Do not scrape, press hard, or probe the gum.

"Worrying before the first birthday" — worry is the one thing that does not change the tooth. Swap it for two dated things: the date you note the first tooth, and a dental visit booked before 12 months. That is the plan that ends the worry, and it is one entry on a calendar.

The 10-minute routine that replaces both (tonight):

1. Ring or cloth from the fridge into the baby's hands (about 2 min).
2. One line written: date + what you saw + how the baby was (feeding, sleep, nappies).
3. Calendar entry for the dental visit (2 min).
4. A handover line for whoever holds the baby next (2 min) — see the script below.

Total: under 10 minutes, no cooking, one adult.

Cool things to chew, from what is already in the house: a teething ring cooled in the fridge; a clean damp cloth cooled in the fridge; for a baby 6 months or older who is already weaning, soft fruit such as melon, with an adult watching the whole time. NHS: cool the ring in the fridge, never the freezer, and never tie a ring around the neck. (NHS, checked 5 Nov 2026 — nhs.uk/baby/babys-development/teething/tips-for-helping-your-teething-baby/)

2) Constraints and the avoid list

• Never freeze a teething ring — it can damage the gums. Cool it in the fridge only, and follow the time on its own instructions.
• Never anything around the neck: no ring on a string, no amber necklace, no beads on a string. NHS: a ring tied around the neck "may be a choking hazard".
• Teething gels: little evidence they work; ordinary mouth pain gels are not suitable for children; pharmacy-only, and worth a pharmacist's advice first.
• Homeopathic teething powders and tablets: not recommended, and some unlicensed ones sold online have been linked to serious side effects. Skip mystery powders and anything bought as a prescription online.
• No aspirin for a child, ever.
• Do not scrape the gum or use anything sharp, and do not tie anything frozen to the gum.
• Sugary rusks, biscuits and juice in a bottle are the fastest way to get decay on a first tooth. Plain milk and water only.
• No honey before 12 months.
• Medicines: I am not choosing or changing anything for your baby, and no amount from me. If you already use a sugar-free pain medicine that a pharmacist or the label allows for your baby's age, keep to that label and that advice — and ask the pharmacist before adding anything, including gels.
• Do not file a fever under teething. Teething does not cause significant or prolonged fever (paediatric febrile-child guidance, rch.org.au, checked 5 Nov 2026). NHS says a temperature slightly raised but under 38°C can accompany teething, and that there is no evidence teething causes diarrhoea — so a temperature of 38°C or above, or diarrhoea, needs its own look, not a teething label.

3) Red flags — when to stop home care and get help

Call your local emergency number now if the baby: cannot drink or feed at all; is limp, floppy or hard to wake; is breathing fast or working hard; has blue or grey lips or skin; has a fit; or has a rash that does not fade when you press a clear glass firmly against it.

A baby under 3 months with a fever of 38°C or above — or who feels hot, unusually cold, or simply "not right" — needs hospital-level assessment today, not a night of watching.

Same-day clinic, not tonight:

• Temperature of 38°C or above along with gum signs — that is not teething.
• Fever lasting more than 5 days.
• Much less milk or formula, or fewer wet nappies than usual.
• Repeated vomiting or diarrhoea.
• Ear-pulling with fever, a high-pitched or continuous cry, or a baby who looks pale, mottled or unwell to you.
• White patches in the mouth that do not wipe off.
• No tooth yet by the 12-month check — bring the visit forward rather than waiting.

4) What success looks like in the next 24 hours

Not a tooth tonight — most first teeth arrive in the first year (some babies start before 4 months, some after 12), and nothing you do tonight changes that. Success is:

• the baby has one cool thing to chew and a calmer evening;
• one line is written down (date, what you saw, how the baby was);
• the dental visit is on the calendar, dated before 12 months;
• the sibling or elder knows the two rules: chilled ring only, no gels or powders, and one line in the log.

Script for whoever shares the care (screenshot this): "Teething is normal and late for some babies. Tonight we do fridge-cool ring only — nothing frozen, nothing around the neck, no gels or powders. If the baby can't feed, is floppy, is breathing hard, has blue lips or a rash that doesn't fade, we call emergency services straight away. If the temperature hits 38°C or above, that's not teething and we call the clinic."

Script for the dentist/child check: "My baby is [age in months] and has no tooth yet / had a first tooth on [date]. What would you like to check, and when would you like to see us again?"

One limit, so you know where I stand: this is not a diagnosis and not a substitute for the dentist or paediatrician — from a message I cannot tell whether your baby's gums or timing are normal for your baby; they confirm that. What I can do is give you the timeline, tonight's steps and the flags.

Two things this answer has no coverage on: your local emergency number, and the local door for a first dental visit — both need your country and city, and I'll look them up as soon as you say where you are.

How old is your baby in months right now? That single number decides which part of the range above applies and whether this week's check should be sooner rather than at the usual baby check.