Most babies push up on their hands and knees between 6 and 9 months old, with the classic rocking motion on all fours typically appearing around 7 to 8 months. This position is a key stepping stone to crawling, which most babies master between 7 and 10 months. But getting there isn’t a single leap. It’s a series of smaller physical milestones that build on each other over several months.
The Progression From Tummy to All Fours
Babies don’t go straight from lying on their stomachs to propping themselves up on hands and knees. The strength and coordination required develops gradually, and each stage sets the foundation for the next.
In the early months, tummy time helps your baby build the neck, back, and shoulder muscles they’ll eventually need. By around 4 months, most babies can push up on their forearms (a mini push-up on elbows). By 6 months, the CDC lists pushing up with straight arms while on the tummy as a typical milestone. At this stage, babies are also rolling from tummy to back and leaning on their hands for support while sitting.
Between 6 and 8 months, things start to click. Your baby may begin pivoting on their stomach, reaching for toys while propped on one arm, and experimenting with getting their knees underneath them. You might notice your baby rocking their torso back and forth during tummy time, which is them testing their balance and figuring out what their body can do. Once they can hold themselves up on both straight arms and pull their knees under their hips at the same time, they’ve reached the hands-and-knees position.
The Rocking Phase
Once babies get up on all fours, they almost always spend time rocking back and forth before they start moving anywhere. This phase can last days or weeks. It looks like your baby is about to take off but can’t quite figure out the coordination to move forward.
There’s a reason for this. At this stage, a baby’s arm muscles are stronger than their leg muscles. Some babies actually push themselves backward before they learn to crawl forward, because their arms do more of the work. The rocking motion helps them build strength in their hips and legs while also developing the balance and coordination needed to shift weight from one side to the other. It’s a workout, not a stall.
What Builds the Strength for This Position
Getting up on hands and knees requires coordinated strength across several muscle groups. Your baby’s shoulders need to be stable enough to bear weight through straight arms. Their core muscles (back and abdominal muscles) have to hold the trunk steady while the limbs move. And their hips need enough strength to support the lower body in a lifted position. Crawling itself then continues to develop all of these areas, along with hand strength, which matters later for grasping, writing, and other fine motor skills.
Tummy time is the single most important activity for building this foundation. The NIH recommends that by about 2 months, babies get 15 to 30 minutes of total tummy time daily, spread across two or three short sessions of 3 to 5 minutes each. As your baby gets older, sessions can get longer and more frequent. Every minute on their belly works the muscles they’ll need to push up, rock, and eventually crawl.
How to Help Your Baby Get There
You can’t rush the timeline, but you can make sure your baby has plenty of opportunities to practice. The most effective strategies are simple.
- Prioritize floor time. Babies need open space on a firm surface to experiment with movement. Devices like bouncers, swings, and infant seats restrict trunk movement, limit self-directed locomotion, and reduce opportunities for independent head and trunk control. They’re fine in moderation, but they aren’t substitutes for time on the floor.
- Demonstrate push-ups. Get on the floor with your baby and push yourself up on your arms. Babies are natural imitators, and watching you model the motion can encourage them to try it. You can also gently support their chest to help them feel what the position is like.
- Place toys just out of reach. Once your baby is pushing up on straight arms, try positioning a favorite toy slightly off the floor, like on a low couch cushion. This encourages them to look up, lift their head higher, and push onto hands and knees to locate it.
- Encourage rocking. If your baby is already on all fours, you can gently place your hands on their hips and help them feel the rocking motion. This teaches them to balance in the position and builds confidence.
Wide Range of Normal
Some babies get up on hands and knees at 6 months. Others take until 9 or 10 months. Some skip the hands-and-knees position entirely and find other ways to get around: scooting on their bottom, rolling across rooms, or army crawling on their bellies. These are all normal variations. Crawling style matters less than the fact that your baby is motivated to move and making progress.
Premature babies often reach motor milestones later when measured by birth date. Pediatricians typically use the adjusted age (calculated from the due date, not the birth date) when assessing milestones in preemies.
Signs of Motor Delay
The American Academy of Pediatrics identifies specific skills that should be present by the 9-month checkup. At that visit, your baby should be able to roll to both sides, sit well without support, grasp and transfer objects from one hand to the other, and show symmetrical movement (meaning they use both sides of their body roughly equally, without a strong hand preference). Pulling to stand and coming to a sitting position from lying down are also expected around this time.
A baby who isn’t yet on hands and knees by 9 months isn’t necessarily delayed, especially if they’re mobile in other ways. But a few patterns do warrant attention: losing a skill they previously had, showing a strong preference for one side of the body this early, or consistently avoiding weight-bearing on their arms or legs. If your baby isn’t showing any interest in moving across the floor by 10 to 12 months, or if their movement looks noticeably asymmetrical, that’s worth raising with your pediatrician.