By 6 months, many babies are learning to sit up, roll both ways, and reach for objects. These new motor skills can make a baby want to practice at night—sitting up in the crib and then crying because they cannot lie back down on their own.

Separation Anxiety Begins

Separation anxiety often starts to appear near 6–8 months. A baby who once settled easily may now notice when you leave the room and protest at bedtime. This is a healthy sign of attachment, even when it is hard at 2 a.m.

Teething and Discomfort

The first tooth usually appears around 6 months, though it can range from 4 to 12 months. Sore gums can cause brief, restless sleep even when teething is not a serious medical problem.

Solids and Feeding Changes

As solids are introduced around 6 months, digestion changes and some babies wake hungry or uncomfortable. Most babies this age still need 24–32 ounces of breast milk or formula per day alongside solids, so night feeding may still be developmentally normal.

Changing Nap Structure

At 6 months, naps typically consolidate from three to two. That transition can cause overtiredness, which—paradoxically—makes it harder to fall asleep and stay asleep.

If a baby always falls asleep while being fed or rocked, they may struggle to return to sleep independently after a normal night waking. This is not “bad” parenting; it is simply a habit worth gently adjusting when you are ready.

How long does the 6-month sleep regression last?

Most babies move through the 6-month sleep regression in about 2–4 weeks once a consistent routine is in place. Some settle faster, especially if sleep habits were already steady. If night wakings and short naps persist beyond a month with no clear cause, mention it at your next checkup so your pediatrician can rule out discomfort or feeding issues.

Is the 6-month sleep regression a real thing?

Yes—though “regression” is a misleading word. Research and pediatric experience show sleep often disrupts around 6 months because of developmental leaps, separation anxiety, teething, and changing nap needs. Your baby has not lost a skill; they are reacting to normal growth. Consistent routines and safe sleep habits usually restores prior patterns within a few weeks.

Should I start sleep training at 6 months?

Many families consider gentle sleep-training methods around 6 months, once a baby is developmentally ready. The American Academy of Pediatrics supports approaches that fit your family, with no crying required. If you choose a method, keep it consistent and pause if illness or teething strikes. Talk with your pediatrician before starting if your baby was premature or has health concerns.

Can teething cause the 6-month sleep regression?

Teething can contribute, especially if the first tooth arrives near 6 months. Sore gums may cause brief, restless wakings for a few days. However, teething alone rarely explains weeks of disrupted sleep. If discomfort seems significant, ask your pediatrician about safe pain relief. For safe sleep setup during this phase, see our safe sleep guide.

Will starting solids help my baby sleep through the night?

Probably not right away. While solids begin around 6 months, most babies this age still need 24–32 ounces of milk daily, and adding food does not reliably extend night sleep. The CDC and AAP note that sleep and feeding are separate milestones. A calm bedtime routine matters more than a full stomach. Always introduce solids safely, one allergen at a time, per your pediatrician’s guidance.