How to Set Up a Cot for Twins: Step-by-Step Instructions

Bringing twins home doubles the sleep setup decisions. The core question — one cot or two — has a clear answer from safety experts: separate sleep surfaces. Twins Trust and the American Academy of Pediatrics (AAP) both lean toward individual cribs to reduce the risk of one baby interfering with the other’s breathing. Here is how to set up each cot correctly.

Two Cribs or One: Safety Guidance

The AAP’s safe-sleep evidence states it is prudent to provide separate sleep areas for twins and higher-order multiples. That means two cribs, or one crib plus a bassinet, is the gold standard. Keeping both in the parents’ room for at least six months is recommended for every infant.

Co-bedding — placing twins in one cot — is only discussed by some UK sources as a limited early-weeks practice. The Lullaby Trust says this should only happen before babies can roll, placed feet-to-foot at opposite ends, far enough apart they cannot touch. That charity explicitly advises against cot dividers. The NHS offers similar feet-to-foot positioning. But given the AAP’s preference, two cribs remain the simplest, most defensible choice.

Step-by-Step Crib Assembly and Mattress Setup

Setting up a safe cot follows the same rigorous checklist for each baby. Mattress fit and the bare crib rule matter more than any accessory.

1. Assemble the crib exactly per the manufacturer’s instructions. Verify every bolt and bracket is tight before placing the mattress.
2. Check mattress size and firmness. It should be firm, flat, and free of pillow-top or memory foam.
3. Test the fit. When pressed against the crib side, no more than two adult fingers should fit between mattress and frame. A snug fit prevents gaps where a baby could be trapped.
4. Fit a tight sheet only. No bumpers, pillows, nests, blankets, toys, or loose bedding.
5. Position the crib away from hazards. Clear of windows, blind cords, and dangling strings. Ensure working smoke and carbon monoxide detectors.

For each sleep, place each baby on their back on the firm mattress. This supine position is the single most important protective measure against SIDS.

What to Skip During a Multiples Setup

Common mistakes are usually well-intentioned additions. Soft mattresses, inclined sleepers, or memory foam toppers increase suffocation risk. Bumpers and nests are decorative hazards, not safety devices. Loose blankets and toys have no place in the sleep area.

If you consider co-bedding despite AAP guidance, never let babies be close enough to touch or obstruct breathing, and keep bedding firmly tucked. When your twins start rolling, co-bedding ends immediately.

Room temperature is another quiet factor. Keep the room at 68–72°F and dress babies in no more than one layer than an adult would wear. Overheating is a recognized SIDS risk, so check for sweating or a hot chest.

Final Twin Cot Setup Checklist

Before the first night home, run this checklist for each crib.

• No gap wider than two fingers between mattress and frame.
• Tight fitted sheet only — no bumpers, pillows, nests, or soft objects.
• Each baby placed on their back, in the same room as you, for every sleep.
• Crib far from windows, cords, and dangling items.

If you are deciding between crib models, our roundup of the best cots for twins breaks down the safest choices by budget and room size.