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Most babies start in a bassinet or bedside sleeper next to a parent's bed, and most eventually move to a crib in their own room — but the "when" and "how" cause more anxiety than almost any other sleep decision. There's a real window that works best, and a gradual approach beats an abrupt one for most families.
When to make the move
- Your baby has outgrown the bassinet's weight or size limit (most cap out around 15-20 lbs or once baby can push up on hands and knees).
- Your baby is starting to roll — a bassinet's smaller space becomes less safe once rolling begins.
- Around 3-6 months is the most common window, though there's no single correct age — a baby sleeping well in a bassinet at 4 months doesn't need to move just because of a calendar date.
A gradual transition plan
An abrupt, cold-turkey move to an unfamiliar room and surface is the single biggest reason crib transitions go badly. A staged approach gives a baby's nervous system time to adjust to each change separately instead of all at once.
- Step 1: Move the crib into the parents' room first (if it isn't already), so the sleep surface changes while the room stays the same.
- Step 2: Start with naps in the crib before committing to overnight sleep there — naps carry lower stakes if it takes a few tries.
- Step 3: Keep the existing bedtime routine identical — same order, same sounds, same lighting — so the crib is the only new variable.
- Step 4: Once naps are going well, move to the crib for the first stretch of the night, then gradually the whole night.
- Step 5: If a separate room is also part of the plan, move rooms only after the crib itself feels settled — don't stack both changes at once.
Safe sleep basics in the crib
- Always place baby on their back, on a firm, flat mattress with a fitted sheet only.
- No pillows, loose blankets, bumpers, or stuffed animals in the crib before 12 months.
- A sleep sack is a safer alternative to loose blankets for warmth once swaddling has stopped.
- Keep the crib in a smoke-free room at a comfortable, moderate temperature.
Frequently asked questions
What if my baby cries every time I put them in the crib?
Some protest crying at the new surface is common and usually settles within a week or two of consistent naps and bedtime routine in the crib. If crying is intense or doesn’t improve at all after two weeks, it’s reasonable to pause and try a slower, more gradual reintroduction.
Is it too late to move to a crib at 8-9 months?
No — there is no cutoff age. Older babies may take a bit longer to adjust to a new sleep surface since they notice more, but the same gradual, naps-first approach still works.
Should room-sharing and crib transition happen at the same time?
It’s usually easier to separate them — move to the crib first while still room-sharing, then move rooms once crib sleep is settled, rather than changing everything on the same night.
