Don't worry. Never give up.. Keep on reading, talking, singing to him.. Interact with him. Every child grow at their own rate. My girlfriend's son, only started to call "Mummy" (HIS FIRST WORD!!!!) when he turns 3 on MOTHER's DAY!. He is doing fine. He is Nanyang Pri now.
Once they...
You can try Parent Volunteer which will get you higher chance. Your boy born in 2004? Then by end of this year, you should apply for PV which you entitled you to fall under Phase 2B.
Otherwise if you go under Phase 2C, based on your distance and past history, you don't even have the chance...