How are Next children's shoes for size? Should I buy the same size as her Clarks measurement?

[Cadelaide]

Oh, and are they ok for quality?

(Sorry if wrong topic, btw)

DS had Next sandals all summer, same size as his Clarks measuremment. He wore them most days (even when it was raining ) and they're still in pretty good nick.
The shoes are probably similar quality.

Thanks Tim, I'll go for them then.