T.H.
Well my 3 year old is pretty clumsy with the old school skates, even though she loves them, and so I can't really imagine in line skates would work at all, I don't even think she'd be able to stand up! We go to a toddler skate at a local skating rink and the little kids skates are all tampered with so that they don't roll fast...even then she falls down quite a bit. She has also used those plastic over the shoe skates and she loves though too, but same problem! She has a blast so I'm sure your 3 y/o will too, but personally, I'd go with the slow, old ones so your child has time to warm up to the idea of skating!