There is no direct correlation between a child’s early teething and his or her IQ. It is not scientific to say that a child’s IQ is lower if he or she is late in teething. The early and late teething of a child is related to many factors, such as individual physical factors, genetic factors, living environment factors, food habits and many other factors. Some children’s parents are early teething, in this case the child will be relatively early; if both parents are late teething, the child will also be relatively late teething, but this is not absolute, but also according to the child’s personal constitution has a certain relationship. Under normal circumstances, the baby will teething between 4-6 months, but parents should not force too much, as long as the child erupted the first tooth before 12 months, are considered normal, do not need to worry too much.