Mothers are particularly hesitant about getting the COVID-19 vaccine for themselves and their children, according to the latest data.

For instance, one in three younger mothers say they are “extremely unlikely” to vaccinate their children, according to the COVID States Project, a nationwide survey that also found higher rates of “vaccine resistance” among mothers.

Another poll from Morning Consult found that while nearly two-thirds of all adults have either already been vaccinated against COVID-19 or plan to do so, mothers rank highest among those unwilling to get vaccinated or uncertain about getting their shot, at 51% — roughly 20 percentage points higher than other women at 32%, fathers at 29%, and other men at 28%.