Should a 6-Month-Old Be Sitting Up or Crawling?

What does sitting usually look like at 6 months?

At this age, many babies are still learning to balance. They may sit between your legs, steady themselves with both hands in front, or topple when they reach for a toy. The CDC's 6-month list describes leaning on the hands for support—not sitting upright alone for a long stretch.

By 9 months, the CDC list includes getting into a sitting position and sitting without support. These lists show skills that most children—about 75% or more—can do by the listed age. They are conversation tools, not diagnostic tests or exact deadlines.

Does a 6-month-old need to crawl?

No. Crawling is not on the CDC's 6-month or 9-month milestone checklist. The American Academy of Pediatrics (AAP) notes that many babies begin crawling later, while some move by scooting or sliding and some never use a classic hands-and-knees crawl.

Instead of asking whether crawling has started on time, notice whether your baby is gaining ways to explore: reaching, rolling, pushing up, pivoting, sitting with increasing control or moving toward an interesting object. The sequence can differ from one baby to another.

What is more useful to watch than one deadline?

The CDC's 6-month movement list also includes rolling from tummy to back and pushing up with straight arms during tummy time. Watch how your baby uses both sides of the body, supports the head and trunk, reaches for toys and changes position over time. One awkward attempt or one missed day is less useful than the direction of progress across several weeks.

If your baby was born more than three weeks early, the CDC checklist advises using corrected age. Your pediatrician can explain how long corrected age is useful for your baby's individual development.

How can you support movement safely?

Give your baby supervised time on a firm floor or play mat, on both the tummy and back, with a toy placed within or just beyond easy reach. Sit close enough to prevent a fall while they practice balancing. Short, frequent opportunities are more useful than propping a baby into a position they cannot yet control.

Once rolling or reaching begins, use the floor for play and diaper changes whenever practical, and never leave your baby unattended on a bed, couch or changing table. The AAP advises against wheeled baby walkers because they do not teach walking and can cause serious injuries.

When should you call the pediatrician?

Bring it up now if your baby has lost a skill, consistently uses one side much less than the other, feels unusually stiff or floppy, has poor head control, or is not making movement progress. Also contact your pediatrician if one or more CDC milestones are not yet present or if your instinct says something is not right; you do not need to wait for the next well-child visit.

Ask whether your baby needs a standardized developmental screening or referral to early intervention. A milestone checklist can start that conversation, but it cannot diagnose a delay. Call 911 for a sudden loss of movement together with trouble breathing, blue or gray color, a seizure, unresponsiveness or another immediately life-threatening change.

Related United States guides

The month-by-month guides place movement alongside feeding, sleep, growth and the US well-child schedule.