Whew! I get this question literally every day in my practice. It is a HUGE concern from parents with a child with developmental delay as well as most parents in general.

Well, let me say that there is absolutely no way that anyone can predict this, however, there are stages and general developmental skills that usually have to be in place.

Not every child has to crawl in order to walk; but I highly recommend that you seek help from a therapist if your child tries to skip this phase or if they only crawl for a few days. Once your child begins to crawl, encourage this and notice that he/she will quickly be pulling to stand.

Once in standing, your child has to develop balance and strength as well as confidence to take a first step.

NEVER back up as your child walks to you. They will be less likely to trust you again if they feel scared during those first trials. 

I am producing some materials that will be available soon to assist you with learning how to help encourage your child with these skills. For now give your child plenty of supervised floor time.