Crawling is a huge milestone in your baby’s life – once they are moving there is no stopping them. Most kids will just do it on their own accord, but some might need a little helping hand. Keep in mind though that a few babies can in fact skip the whole crawling step and just start walking.
Here are a few things you should know when it comes to your baby's crawling: 
When will they start?
Most babies will start before they reach ten months old, but some can be a little later. Certain situations will depict when they start. For instance, if your baby is being carried everywhere or toys are always within their reach, they simply have no need to crawl around – everything is right there in front of them.
What you can do to help 
You baby needs to get used to pushing themselves up off the ground with their hands, so give them plenty of tummy time. This will help them to build up strength which is needed to help them hold their body weight up. And, rather than simply handing them a toy, put it slightly out of reach so your little one has to stretch out to get it. This will encourage them to start moving towards it.
How they will move
Not every infant will start crawling on their hands and knees. In fact, many will either push themselves backwards on their stomach, pull their body along with their elbows, shuffle along on their bum or even do a bear walk – walking on their feet and hands.
When to be concerned
After they start moving, you may notice that your infant doesn’t crawl like others kids. While you don’t need to be overly concerned, if your little one is dragging one side of their body, or only uses a certain arm or leg to get them moving you should mention it to your GP.  You should also tell your doctor is your baby has not made any interest in becoming mobile or learning to move without help by the time they are 11 months old.
What if they don’t crawl?
Remember, every baby is different and not all will goign through the crawling stage - some will simply go from sitting up to standing. This is not cause for concern, and your child is still developing correctly.