.wt-header__nav-teaser__item:nth-child(4),
.wt-header__nav-teaser__item:nth-child(5) {
    display: none;
}
@media screen and (min-width: 1350px) {
    .wt-header__nav-teaser__item:nth-child(4) {
        display: block;
    }
}
@media screen and (min-width: 1500px) {
    .wt-header__nav-teaser__item:nth-child(5) {
        display: block;
    }
}