When Does Baby Reflux Peak? What Parents Should Know

Baby reflux often becomes more noticeable during the first few months and typically peaks around 4 months of age, when babies still spend much of their time lying down and the muscle that keeps stomach contents in place is developing. For many babies, spit-up gradually eases as they grow, sit more upright, and begin eating solids, though the timing varies and some continue to have reflux beyond their first birthday.

Reflux may stand out most right after a feeding, especially if your baby has taken in a lot of milk or swallowed air, and you may notice more spit-up when you lay them down soon afterward. A fussy evening does not necessarily mean reflux is worsening, so it helps to notice whether discomfort consistently happens around feeds rather than assuming every cry has the same cause.

Check the product’s listed specifications when evaluating what can make a rough stretch feel worse.

Try burping your baby during and after feeds, and ask your pediatrician whether smaller, more frequent feeds make sense for your baby’s age and feeding needs. You can hold your baby upright while they are awake after a feeding, but for every sleep, place them on their back on a firm, flat surface without wedges, positioners, or an inclined sleeper.

Check the product’s listed specifications when evaluating what can you do during the peak months.

Let your pediatrician know if spit-up comes with feeding refusal, persistent pain, poor weight gain, or symptoms that are getting worse rather than easing over time. Seek prompt medical advice for green or bloody vomit, forceful repeated vomiting, signs of dehydration, or breathing trouble; our guide to tracking baby reflux, feeding, sleep, and comfort and our Baby Reflux Relief Checklist can help you organize the patterns you want to discuss.