Flex align items

HTML

<div class="parent">
    <div class="child"></div>
    <div class="child"></div><div class="child"></div><div class="child"></div><div class="child"></div>
</div>

CSS

.parent {
    align-items: flex-start;
    background-color: yellow;
    display: flex;
    height: 200px;
}

.child {
    background-color: blue;
    height: 100px;
    width: 100px;
}

.child:nth-of-type(2) { background-color: red; }