Although baby teeth which is also known as milk teeth, can arrive in any order, many baby follow a loose pattern. In normal case, your baby start teething around 6 months, and it can take up to 3 years for all the teeth to come through. But again, this is just a general reference guideline as some baby remain toothless until they're more than a year old.
It may seem a long way off now, but it's best to carry on brushing your child's teeth for baby as soon as the teeth emerge until he or she able to do it properly themself.