I don't see curling.The little black one that standing by itself you can see her foot how the toes curl under the other one is the same way except his is a little worse or her
For curled toes, I use tape booties to correct it. Depending on how severe the the curled toes are, it will take awhile to correct.
This girl had a curled toe that was corrected within about 30mins to an hour.