Keeping this in mind, guaranteed insurability riders allow the insured person to add additional insurance amounts at specific times / events, at an additional premium. (policybazaar.com)
Some life insurance policies for children come with an optional guaranteed insurability rider / endorsement that may available for a nominal cost. (protective.com)
Such provisions, called guaranteed insurability riders or guaranteed purchase options, provide for the purchase of additional insurance at certain times in the future, regardless of any changes in health. (blog.massmutual.com)