Can a 3 month old sleep on a raised or tilted mattress for reflux?
Short answer: No. Keep the sleep surface flat. The Lullaby Trust says not to incline, tilt or prop the mattress or cot, as it does not help reflux. Speak to your doctor instead. Safer-sleep advice applies until 12 months, about 9 months from 3 month.
Use the same advice for every sleep, day and night, until 12 months.
What the guidance says
- Keep the sleep surface flat. Do not incline, tilt or prop the mattress, cot or baby: it does not help reflux. Speak to your doctor about reflux.
- Use a firm, flat, waterproof mattress in good condition, with no raised or cushioned edges, that fits the cot or Moses basket with no gaps.
Shop at Baby Kingdom
- Kidsaw Freshtec Starter Foam Toddler Cot Bed Mattress
- Kidsaw Deluxe Sprung Toddler Cot Bed Mattress
- Obaby 100 x 50cm Foam Cot Mattress with Washable Cover
- Jay-Be® Toddler Anti-Allergy Sprung Mattress
Check each product page for its exact dimensions, mattress size, age and weight limits and safety standards.
More advice
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Sources
- The Lullaby Trust: Sleeping position (accessed 2026-10-21)
- The Lullaby Trust: Baby mattresses and bedding (accessed 2026-10-21)
General information only, not medical advice. Always follow your product's instructions. If you are worried about your baby, contact your GP, health visitor or 111. In an emergency, call 999.