My 17.5 month old went from being happy
Ask
My 17.5 month old went from being happy in her crib and falling asleep completely independently to panic screaming and throwing up at bedtime.
Our routine hasn't changed. She's been falling asleep on her own since she was 4 months old.
On Monday at bedtime, she panic screamed so hard I ran in thinking she was physically injured. She seemed fine so I gave her a hug, calmed her down, and left again. Within not even 30 seconds of screaming, she threw up everywhere and rolled in it. We had to shower her, change sheets, and clean the whole room.
After cleaning her up, I ended up staying with her until she fell asleep. We are now on night 5 of sitting next to her crib, patting her bum for over an hour until she sleeps.
Everything I read says "stay consistent and don't change your routine", but am I supposed to let her throw up, clean her up, and put her right back in?
I don't want to create a permanent habit where I have to sit with her for an hour every night, but if I leave she screams until she vomits. How do I get through this 18-month regression without traumatizing her or breaking our sleep foundation?
Answer
**This is night 5 of a sudden bedtime regression, not a loss of her sleep skill.**
She could fall asleep on her own at 4 months. That foundation is still there. What changed Monday was a precipitating event — a panic scream hard enough that you ran in, then a vomit she didn't expect — layered on top of the normal 18-month separation-anxiety peak and language/cognitive leap. She hasn't forgotten how to sleep; she's learned that the moment you leave is now scarier than it was a week ago.
The vomiting matters. At this age, some toddlers retch and vomit from the vagal response to very intense crying — it's physiological, not "acting out." That rules out the "close the door and wait it out" approach. You need a plan that keeps her feeling safe *and* moves your body gradually out of the room.
**The fork is gradual withdrawal (the "chair method"), not extinction.** You're not choosing between "sit with her forever" and "let her scream until she vomits." There's a middle.
**Tonight, three moves:**
1. **Park a chair beside the crib.** Same bedtime chain you've always used — pj's, teeth, books, into the crib awake. Sit down. Pat, shush, low voice. Stay until she sleeps.
2. **If she escalates to panic, do a brief check-in, not a return.** ~30 seconds, calm: *"Mommy's right here. It's bedtime. You're safe."* Pat for a moment. Step back to the chair. Don't pick her up — the lift spikes her alert system and resets the clock.
3. **If she vomits, make clean-up boring.** Towel on the mattress under her head *before* you start the routine each night (it buys you a fast reset). Quick wipe, fresh sheet, calm *"all done, back to bed."* Sit back down. Don't abandon the room for the night, but don't linger either.
**Weekly anchor — one sentence, no questions back:**
*The chair moves one step farther from the crib every two nights, and her wake-up time stays the same every morning, weekends included.*
Sleeping in to "make up for it" flattens tonight's drive. The chair moves on schedule whether last night was calm or rough — don't let one good night trick you into jumping three steps.
**Take it to the clinician if:**
- She vomits outside of crying episodes (daytime, after meals, no tears first) — that's a different conversation.
- She refuses fluids for more than a few feeds, has a fever, or seems in pain.
- The panic hasn't softened at all by the two-week mark, or it gets *worse* despite the gradual withdrawal.
- Bring it up at her 18-month visit either way — pediatricians see this every week and won't think you're overreacting.
**What I'm not doing here:** no melatonin dose, no cry-it-out protocol, no sleep-restriction math for a toddler. The vomit risk and her age put those off the table. The chair method works because you're present enough that she doesn't trigger the panic-to-vomit loop, and gradual enough that the new association she's learning (crib + you-farther-away + still-safe) replaces the one Monday carved in.
One thing to file away — if next week she's still climbing out of the crib, or the panic starts at naps too, tell me and we'll adjust.
来源：AAP / NHS safe-sleep guidance (crib setup confirmed appropriate for her age) · AASM 2016 pediatric duration consensus (1–2 y: 11–14 h including naps) · first-party heuristic on gradual withdrawal for vomit-risk toddler regressions. Bring concerns to her pediatrician, not to a sleep coach, if the red flags above appear.