At nine months keep them in bare feet if possible for walking and for as long as possible, (this is easier in the summer months but not the winter) this isn't though always possible. Get as soft leather as you can for the shoes, the softer the better and get them as good a fit as you possible can. The keep checking them every months for growth, change as soon as needed. If you can get soft suede even better.
Clarkes or startright are not better than one another it really will depend on your own childs feet, go to a proper shoe shop and get an experiance fitter. Avoid where possible top seams running across the front of the shoe - if the shoe is plain it is better as seams can cause there own seperate problems!! Seams though not patterned holes in the shoe.