mother tongue

I am a Malay Single Mummy. My toddler is 1 year old coming August. My ex husband is chinese. I am not sure if I am going to face challenges in few years down the road. As I have custody and care control of the child, my ex doesn't come and sees the child. Is it a must to take Chinese language as a mother?? What are the pros and cons?? I don't speak Mandarin at all. How.