I bought the cutest pair of saltwater sandals for my little boy. They look adorable and seem to fit just fine, but he REFUSES to wear them. He says they hurt and cries until I take them off. I am so disappointed... any tips?

http://www.zappos.com/salt-water-sandal-by-hoy-shoes-sun-san-sharks-infant-toddler?zfcTest=fcl%3A0