20/02/2026
Does your baby seem very stiff or constantly arching their back?
Back arching is common in babies and is often completely normal. Research shows infants use whole-body extension as part of early motor development. It can happen with:
• Frustration or overstimulation
• Self-soothing attempts
• Tummy time exploration
The Moro reflex (startle reflex) is also normal from birth and usually integrates by 3–4 months. Babies may briefly extend or arch when startled.
When is it worth looking closer?
If arching is frequent, persistent, or interferes with feeding, holding or dressing, it can sometimes be linked to discomfort.
One possible cause is Gastroesophageal reflux, where babies may arch due to oesophageal irritation. In rare cases, marked arching with reflux is described as Sandifer syndrome.
Look for accompanying signs such as:
• Feeding difficulties
• Frequent vomiting
• Irritability during or after feeds
• Poor weight gain
Arching can also be seen in babies with excessive crying, often labelled Infant colic.
Most arching is benign but if it’s constant, difficult to settle, associated with unusual movements, delayed milestones, or simply doesn’t feel right, trust your instincts and seek professional advice.
If you’re unsure whether your baby’s arching is typical or tension related, reach out. Early support can provide clarity, reassurance, and gentle guidance tailored to your baby.