6-12 Month Sleep: Teething, Solids, and New Night Wakings

Between 6 and 12 months, a baby's sleep goes through more change than it will in the entire following year. This isn't a stretch to expect stability from: teething, starting solids, crawling, and the arrival of separation anxiety often come in overlapping waves, and each one can temporarily disrupt nights that seemed settled. Understanding which factor is affecting sleep at a given moment helps you respond with the right approach, instead of trying to "fix" everything the same way.

What's really changing in these months

Around 6 months, many babies are biologically ready to consolidate nighttime sleep into longer stretches, often 6-8 hours in a row. But "biologically ready" doesn't mean "automatic": new developmental milestones — sitting up, crawling, first teeth — take energy and mental processing that can temporarily interfere with sleep quality, even in babies who were already sleeping well.

Every new motor or cognitive milestone almost always brings a small earthquake in sleep — it's normal, and it's temporary.

Teething and sleep: what's normal to expect

The first teeth usually come in between 6 and 10 months. Discomfort is real in the days right before a tooth erupts, but it tends to be overrated as the cause of prolonged wakings over time: if night wakings last for weeks with no other signs (swollen gums, heavy drooling, daytime fussiness), it's worth considering other causes before blaming teething for everything.

Starting solids and night wakings

Introducing solid foods can temporarily disrupt sleep for digestive reasons, but in most cases, once the digestive system adjusts to new foods, sleep tends to stabilize or even improve, because more complete meals during the day reduce the need for nighttime feeds driven by actual hunger.

A note on methodology: this guide is based on widely shared general pediatric guidance. For specific questions about weaning or food allergies, your pediatrician remains the main reference.

Crawling and separation anxiety

Around 8-9 months, many babies develop genuine separation anxiety, which shows up at night too: the baby wakes up and needs to see or hear a parent to settle, even if they used to fall back asleep on their own before. This isn't a step backward in sleep independence, but a normal emotional milestone — often a brief, consistent reassurance (a voice, a pat) is enough, without necessarily picking them up every single time.

How to update the routine at this stage

Around 6-9 months, many babies drop from three to two daytime naps, and the bedtime routine can welcome new elements (a book, a different song) that mark the baby's growth without overhauling the core sequence. Consistency remains key: even with all this change happening, keeping the same order of actions before bedtime helps the baby find their footing while everything else is moving fast.

The bottom line

Between 6 and 12 months, sleep doesn't get worse because of a parenting mistake — it's responding to an enormous amount of development happening in parallel. Recognizing which milestone is affecting sleep at a given time, and responding with patience and consistency, works better than any attempt to "fix" the problem with drastic solutions.

This article is for informational purposes only and is not medical advice. For any concerns about your baby's health or development, please consult your pediatrician.