School daycare; is she abusing them??

So I'm in high school & I have a 4 month old.. So I'm currently breastfeeding & my son is in the school daycare which is great I get called down to feed him whenver he gets hungry. So toddlers & infants are in the same room but a small wall separates them, I noticed that the lady that takes care of the toddlers is very rough with them... Whenever it's nap time she puts a blanket over their heads & pat their backs.. Hard... She also lets them sleep like that with the blankets over their heads. Idk but for me that isn't good can't they suffocate like that? I mean they're big yeah I know they can remove the blankets from their heads but whenever they do she puts it back on their face!! Is this abuse?? 

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