A 10-month-old waking up crying is almost always tied to one of a handful of predictable causes: a developmental leap, separation anxiety, teething, or difficulty linking sleep cycles. Most of the time, several of these overlap at once, which is why this particular age feels so rough for sleep. The good news is that these disruptions are temporary, typically lasting two to six weeks before settling down.
The 8-to-10-Month Sleep Regression
Around 10 months, your baby’s brain is working overtime. They’re learning to pull up to standing, cruise along furniture, crawl with more confidence, feed themselves, wave, and play simple games. All of that new wiring makes it harder for their brain to power down at night. Your baby isn’t waking to frustrate you. Their nervous system is genuinely busy processing new skills, and that processing doesn’t stop when the lights go out.
This regression is one of the more disruptive ones because it combines physical milestones with a major emotional shift (more on that below). It can show up as trouble falling asleep, more frequent night waking, shorter naps, or all three at once.
Separation Anxiety Peaks Right Now
Separation anxiety typically peaks between 10 and 18 months, then gradually fades in the second half of the second year. At this age, your baby understands that you exist when you leave the room but doesn’t yet trust that you’ll come back. That’s a stressful combination. During the day, it looks like fussing every time you walk out of sight. At night, it means your baby may refuse to let you leave at bedtime and then wake up searching for you in the middle of the night.
When your baby wakes between sleep cycles and you’re not there, the distress is real. They aren’t manipulating you. They’re experiencing a normal developmental phase where your presence equals safety, and your absence feels alarming. This is one of the most common reasons a baby this age wakes up already crying rather than babbling or fussing first.
Teething Pain Is Easy to Miss at Night
At 10 months, your baby is likely cutting their upper lateral incisors (the teeth on either side of the top front teeth, which typically come through around 9 to 11 months) or their lower lateral incisors (10 to 12 months). Teething pain tends to flare at night because there are fewer distractions.
Signs that teething is contributing to the wake-ups include red or swollen gums where a tooth is pushing through, one flushed cheek, more drooling than usual, gnawing on everything, ear rubbing, and a mild temperature below 38°C (100.4°F). If your baby seems especially hard to console when they wake, and you notice any of these signs during the day, teething is likely part of the picture.
How Sleep Cycles Work at This Age
Babies have shorter sleep cycles than adults. A single cycle lasts roughly 45 to 60 minutes, compared to about 90 minutes for an adult. At the end of each cycle, your baby briefly surfaces into lighter sleep. Adults do this too, but we’ve learned to roll over and drift back off without fully waking. A 10-month-old hasn’t mastered that skill yet.
Babies also spend a larger proportion of their sleep in lighter, active sleep (REM) rather than the deep, quiet sleep that dominates adult nights. During these lighter phases, they’re more easily disturbed by discomfort, noise, hunger, or simply the realization that conditions have changed since they fell asleep. If your baby fell asleep while being rocked or fed and then wakes in a still, dark crib, that mismatch alone can trigger crying.
Standing Up and Not Knowing How to Get Down
One of the most common sleep disruptors at this age is deceptively simple: your baby pulls to standing in the crib and then can’t figure out how to sit back down. They’re stuck, frustrated, and fully awake. Some babies will also happily practice cruising along the crib rail instead of sleeping, then get overtired and melt down.
The fix is daytime practice. The more your baby rehearses pulling up and lowering back down during waking hours, the faster the skill becomes automatic and stops being a novelty worth practicing at 2 a.m. Plenty of crawling, climbing, and physical play during the day also builds up healthy sleep pressure so your baby is genuinely tired at bedtime.
Hunger, Habit, or Both
By 10 months, most healthy babies don’t need calories overnight. They’re eating solid foods during the day and can take in enough nutrition between morning and bedtime to sustain them through the night. That said, many babies still wake expecting a feed because it’s what they’ve always known. Feeding is comforting, and comfort is exactly what a baby with separation anxiety or teething pain is looking for.
If your baby is growing well and eating solid meals plus milk during the day, overnight feeds at this age are more about soothing than nutrition. That doesn’t mean you have to stop them immediately, but it does mean hunger is less likely to be the root cause of the crying. Gradually shifting calories into daytime hours can help reduce feed-to-sleep associations over time.
Wake Windows and Overtiredness
At 9 to 10 months, the average wake window is about 2.5 to 3.5 hours. Most babies this age do well with two naps (one to two hours for the first, one to one and a half hours for the second) and two longer stretches of nighttime sleep totaling roughly 12 hours, with one to three brief awakenings overnight being normal.
If your baby stays awake too long past their window, their body releases stress hormones that make it harder to fall asleep and stay asleep. The result is paradoxical: an overtired baby fights sleep harder and wakes more often, not less. Watching for early tired signs (zoning out, rubbing eyes, getting clingy) and starting the wind-down before your baby hits the wall can make a noticeable difference in how the night goes.
What Actually Helps
A consistent bedtime routine is one of the most effective tools you have. About 20 minutes of the same quiet, enjoyable activities in the same order each night helps your baby’s brain recognize that sleep is coming. This could be a bath, a book, a song, dimmed lights. The predictability itself is calming.
When your baby wakes crying, responsive settling means offering comfort while gently helping them learn to fall back asleep. That might look like patting, rocking, sitting beside the crib and using your voice, or simply saying “I’m here, time to sleep” and making soft shushing sounds. The goal isn’t to withdraw all comfort at once. It’s to gradually reduce the intensity of help over time, at a pace that works for your baby.
A practical approach: if you currently feed your baby to sleep, try feeding until drowsy but not fully asleep, then switch to rocking. Once rocking works easily, shift to hands-on settling like patting in the crib. Once patting works, slow it as your baby gets drowsy and eventually try stepping back. Each step should feel comfortable before you move to the next one. If your baby gets very upset at any stage, it’s fine to stop, give a cuddle, and try again next time. There’s no deadline.
For separation anxiety specifically, short practices during the day help. Leave the room briefly and return with a calm, cheerful tone. Over time, your baby builds confidence that you always come back. At night, a brief verbal reassurance from the doorway can sometimes be enough to help them resettle without a full pickup.