That's typical nutrient deficiency, especially P and N. Stunted plants, phenolic accumulation, etc.
Now, I don't know your growing conditions, but at this stage of young plants that is usually caused by poor root development or too wet and cold soil or very dry.
The usual course of action is to wait, the first signs of recovery will be a dark greening of the tops, the loss of those anthocyanins. I've seen commercial growers really like to use dilute foliars at this stage, to bypass those roots and kickstart the plant earlier.
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