I have been married with my wife for 3 years now. We have a son aged 1 year 10 months.?

Recently she ran away with my son to her moms place without my knowledge. We are still married. She has also sent an affidavit through her lawyer for "child custody". I feel that i should get the full custody as a father to my child as my wife ran away without my permission. Please advice pertaining to Malaysian Child Custody Law pertaining to my case?