<P>call ICA to check. I think u can use the Certificate of Residence (HU KOU).</P><P>for travelling to Sin, Either u put ur child as a depedent in your/wife's passport, or apply for a new one for himself.</P><P>I suggest the later one.</P><P>Considering the case when u and your child travel togetehr, when ur wife also need her passport....</P>