The problem is also: If children find it difficult to breathe, they use it
Mask may not open properly, according to Stiftung Warentest. This allows air to flow in and out relatively freely.
If you want to protect your child particularly well for a short time in a crowded train, for example, you should use the adult mask instead 3M Aura 9320+ (to Amazon) set, advises the Stiftung Warentest. She was already the test winner when testing adult models. Their breathing comfort is okay for children, their filter effect is high and they also fit small heads.
For permanent wear, however, surgical masks for children are the better choice. Yes, they offer little self-protection. But: They protect others, that is their main purpose. If all children in the classroom wear these masks, this, in combination with other measures such as regular ventilation, reduces the risk of infection considerably.