Welcome to the forum Cainta 2015

I'm sorry to hear that your application for a visit visa was refused, especially since you are longing to see your new grandchild. I can't offer any concrete suggestions, particularly since you did over-stay on a previous visit but hope that you can find a way to convince those considering any future application that you have sufficient ties to return to Philippines. Enclosing a letter with any new application to explain the circumstances around your over-staying might also help on compassionate grounds.

Best of luck