Why does my baby arch their back after feeding?

When a baby arches their back during or after feeding, it often means they’re uncomfortable, but it doesn’t point to one single cause. Common possibilities include:

• Reflux / GER: Milk or stomach contents can come back up and irritate the esophagus, which may make a baby arch, squirm, or cry.
• Trapped gas / swallowed air: Air swallowed during feeds can cause belly pressure and discomfort.
• Overfeeding or a too-fast bottle nipple: A full stomach or fast flow can make feeding uncomfortable and worsen spit-up.
• Cow’s milk protein allergy/sensitivity: This can cause tummy pain, fussiness, and feeding discomfort.

What may help:

1. Keep baby upright after feeds for about 20–30 minutes.
2. Burp during and after feeds.
3. Use a slower-flow nipple and keep bottle-fed babies more upright.
4. Offer smaller, more frequent feeds if overfilling seems to be an issue.

When to call the pediatrician:
Get medical advice if the arching is frequent or severe, or if it happens with projectile vomiting, poor weight gain, breathing trouble, blood in vomit or stool, or extreme distress during feeds. Persistent back arching can sometimes be seen with GERD or other conditions that need evaluation.

If this is happening often, it’s worth discussing with your pediatrician, since the exact cause can vary and symptoms can overlap.