How Long Does Baby Reflux Last? A Timeline for Parents

By Dr. Roberto Albani, Pediatrician and Gastroenterologist

Understanding Baby Reflux

It’s one of the most-asked questions from exhausted parents at 3am, mid-feed, with a muslin cloth in one hand: when does this actually stop?

The honest answer is that reflux follows a predictable pattern for most babies, but “predictable” doesn’t always mean quick, and it’s completely understandable to want a clearer sense of what’s ahead. Here’s a realistic, month-by-month look at how baby reflux typically progresses, and what’s worth watching for along the way.

Baby Reflux: What to Expect and When It Gets Better

Why Reflux Happens in the First Place

Before the timeline, it helps to know why reflux happens at all. The valve between your baby’s food pipe and stomach, the lower oesophageal sphincter, is still immature at birth. It doesn’t consistently stay closed the way it will later, which means stomach contents can travel back up more easily. Combine that with a predominantly liquid diet, a lot of time spent lying flat, and small stomachs handling frequent feeds, and reflux becomes extremely common in the first year; not a sign that something has gone wrong.

A General Timeline

Every baby is different, and this isn’t a strict schedule, but most babies with ordinary reflux (GER) follow a broadly similar pattern:

Birth to 2-3 weeks Reflux is uncommon this early. If symptoms appear right from birth, it’s worth mentioning to your GP, as it may point to something other than typical reflux.

2-3 weeks to 4 months This is when reflux typically begins and tends to build. Spit-up becomes more frequent, sometimes after every feed, and may seem to get worse before it gets better.

4-5 months Symptoms usually peak around this point. If your baby’s reflux feels at its most intense during these months, that’s consistent with the typical pattern, not a sign it’s worsening long-term.

6-9 months Improvement usually begins here, often coinciding with your baby starting to sit up more, spending less time lying flat, and beginning solid foods — all of which naturally ease reflux.

9-12 months For most babies, reflux has resolved substantially or entirely by this point, as the valve between the food pipe and stomach matures and your baby spends much more time upright.

Beyond 12-18 months Reflux symptoms that persist significantly past this point are less typical and worth discussing with your GP or paediatrician, as they may indicate gastro-oesophageal reflux disease (GERD) rather than the ordinary reflux most babies outgrow, or another underlying cause worth ruling out.

Wondering if your baby’s symptoms could be linked to reflux?

Take our free 2-minute questionnaire to better understand the signs you’re seeing and get practical guidance on what to do next.

What Can Make It Feel Longer Than It Is

A few things commonly make reflux feel like it’s dragging on, even when it’s following a fairly typical course:

Growth spurts and developmental leaps can temporarily worsen symptoms, even during an overall improving trend.
Starting new foods, teething, or illness can all cause short-term flare-ups that feel like a step backwards.
Silent reflux (where symptoms show up as fussiness or discomfort without visible spit-up) can be harder to track improvement in, since there’s no obvious marker like reduced spit-up to reassure you things are easing.

If you’re not sure whether what you’re seeing is a normal fluctuation or something that needs attention, it’s always reasonable to check in with your GP or health visitor rather than trying to judge it alone.

Making the Wait More Manageable

While you’re waiting for your baby’s digestive system to mature, a few practical things can help reduce symptoms in the meantime:

Smaller, more frequent feeds ease the pressure on a small stomach.
Thorough burping, during and after feeds, helps release swallowed air.
Keeping your baby upright during and after feeds uses gravity in your favour — this is the thinking behind BabyUp®’s 70° incline, designed to replicate the upright position parents naturally use when holding a baby against their shoulder.
Avoiding overfeeding, even when a feed seems to settle your baby quickly, as a very full stomach can make reflux more likely.

When to Get It Checked

Most reflux is simply something to manage through until your baby’s system catches up. But it’s worth contacting your GP or paediatrician if your baby:

Isn’t gaining weight as expected
Consistently refuses feeds or feeds very poorly
Has forceful or projectile vomiting
Shows blood in vomit or stool
Has persistent noisy breathing, coughing, or breathing difficulties
Still has significant symptoms well past 12-18 months

These aren’t necessarily signs of anything serious, but they’re worth a proper look rather than waiting it out.

The Bottom Line

For most babies, reflux follows a predictable arc: appearing around 2-3 weeks, peaking at 4-5 months, and largely resolving by 9-12 months as their digestive system matures. It’s genuinely one of those situations where time does most of the work — but small, practical changes can make the in-between months considerably easier on both of you.

This article is intended for general information and does not replace personalised medical advice. If you’re concerned about your baby’s symptoms or their reflux isn’t following a typical pattern, please consult your GP, health visitor, or paediatrician.

The Albani Team