Wondering when your baby will start crawling? Enter their birth date to see their crawling age window and developmental milestones.
Enter your baby's details to see their developmental stage.
Our Crawling Age Calculator uses CDC developmental milestone data to estimate when your baby is likely to start crawling based on their current age and birth date. Crawling is a major gross motor milestone that typically emerges between 6-10 months of age.
Babies develop at their own pace, and crawling styles vary. Some babies use the classic hands-and-knees crawl, while others may belly crawl, army crawl, or even skip crawling altogether and go straight to walking. The calculator provides a developmental window based on your baby's adjusted age.
Here's the typical crawling timeline:
Remember: every baby is unique. Premature babies may reach milestones later based on their adjusted age (corrected for prematurity). If you have concerns about your baby's development, consult your pediatrician.
| Age (Months) | Typical Milestone | % of Babies Achieving | What to Watch For |
|---|---|---|---|
| 2-3 | Tummy time — pushes up on forearms | 90% | Lifts head 45-90 degrees |
| 4-5 | Rocking on hands and knees | 75% | Back-and-forth rocking motion |
| 6-7 | Belly crawling (commando) | 65% | Pulls body with arms, legs drag |
| 7-8 | Hands-and-knees crawling | 55% | Cross-crawl pattern (opposite arm + leg) |
| 9-10 | Confident crawling | 90% | Fast, coordinated crawling |
| 11-12 | Crawling + pulling to stand | 95% | Transitions between crawling and standing |
Crawling builds neural connections between the brain's left and right hemispheres through cross-lateral movements. This integration supports later skills like reading, writing, and hand-eye coordination.
Crawling strengthens the shoulders, arms, core, and legs. It builds the postural stability needed for sitting, standing, and eventually walking. Strong core muscles from crawling help with fine motor skills too.
Crawling helps develop depth perception and binocular vision. As babies crawl, they learn to judge distances, track moving objects, and coordinate their eyes with hand movements — essential for reading later.
Moving through space teaches babies about distance, direction, and object permanence. Crawling helps them understand that objects exist even when out of sight, a key cognitive milestone.
Most babies start crawling between 6-10 months of age. The average age for hands-and-knees crawling is around 8 months. However, some babies start as early as 6 months, while others don't crawl until 11-12 months — and about 7% of babies skip crawling altogether and go straight to walking.
Yes! Belly crawling (also called commando crawling or army crawling) is a completely normal stage. Many babies start with belly crawling before transitioning to hands-and-knees crawling. Some babies prefer belly crawling and never switch to hands-and-knees — both are developmentally normal.
Don't panic. Some perfectly healthy babies don't crawl until 11-12 months. However, if your baby is not showing any interest in mobility by 12 months, or isn't using both arms and legs equally, consult your pediatrician. Other signs to watch for: not pushing up on arms during tummy time by 4 months, or not bearing weight on legs by 7 months.
Encourage crawling with plenty of tummy time (2-3 sessions daily, starting with short periods), placing toys just out of reach to motivate movement, using a mirror as a visual incentive, and creating safe floor spaces for exploration. Avoid too much time in containers (bouncers, swings, walkers) that restrict movement.
Yes, premature babies often reach gross motor milestones later than full-term babies. Pediatricians typically use adjusted age (chronological age minus weeks of prematurity) to assess developmental milestones for preemies. Most premature babies catch up by age 2, but early intervention can help if delays persist.