The reason for not using X is 小 = Xiao .. which me畅ns that this is only the translation from Chinese Character.
I Steps ? or I-Tracks ?
Both are perfect ..MAN ...
I stands for Infant = Kid = 未成年人
If your product name as "I-Steps" or "I-Tracks" and with a cartoon footprint as a LOGO. It'll become very attractive. I-Steps or I-Tracks mean 我的足迹...
So 小脚印 = Infant Steps or Tracks OR I-STEPS OR I-TRACKS !,